Unit 3.2 : Electronic Information Sources: E-Journals, E-Books, Databases, and Electronic Theses and Dissertations

BLIS-102: Information Sources and Services

1. Introduction

Electronic information sources are central to modern libraries and academic institutions. E-Journals, E-Books, Databases, and Electronic Theses and Dissertations (ETDs) are the most widely used. These resources provide instant, reliable, updated information supporting research, learning, and professional development.

2. Electronic Journals (E-Journals)

E-Journals are scholarly periodicals that are published in digital form. They may exist only in electronic format or digital versions of printed journals. Most e-journals are peer-reviewed, which ensures authenticity and academic credibility. Their prominent features include quick publication cycles, advanced search functions, hyperlinks to references, and multimedia support. Unlike printed journals, multiple users can access them remotely and simultaneously. E-journals are the backbone of research and higher education because they provide the latest findings, case studies, and review articles. They eliminate the delay caused by print publishing, helping researchers keep up with rapid field developments.
Examples: Characteristics: Advantages: Limitations:

3. Electronic Books (E-Books)

E-Books are digital versions of printed books or “born-digital” works created for electronic platforms. They can be read on computers, tablets, smartphones, and dedicated e-readers like Kindle. E-books often include interactive features such as hyperlinks, annotations, multimedia content, and dictionary tools, which make them more flexible than printed books. E-books are portable, searchable, and convenient for users who prefer reading on digital devices. They allow libraries to simultaneously offer unlimited copies of the same book to multiple users, saving space and cost. E-books are also vital for distance education and online learning programs.
Examples: Characteristics: Advantages: Limitations:

4. Databases

Databases are organised collections of data or information stored electronically and accessible through search tools. They may include bibliographic records, abstracts, full-text documents, statistical data, or factual information. Databases are usually subscription-based and are considered essential tools for academic research. Databases are highly structured, searchable, and reliable, making them indispensable for literature surveys, citation tracking, and educational assessments. They save researchers time and provide comprehensive coverage of subject areas.
Types of Databases: Characteristics: Advantages: Limitations:

5. Electronic Theses and Dissertations (ETDs)

ETDs are digital versions of academic theses and dissertations submitted by students and researchers as part of their degree requirements. These works contain original research and are valuable sources of detailed, first-hand information on specific topics. ETDs are usually stored in institutional repositories and accessible through open access platforms or subscription databases. ETDs promote transparency, knowledge sharing, and open access to research. They help prevent duplication of work and serve as valuable references for future researchers. They also showcase the research output of universities and strengthen academic collaboration.
Examples: Characteristics: Advantages: Limitations: E-Journals, E-Books, Databases, and ETDs represent the core components of electronic information sources. They provide rapid, global, and reliable access to scholarly knowledge. These four sources have transformed libraries into digital knowledge hubs, making information more accessible and valuable for research, education, and decision-making.

6. Comparative Table: Electronic Information Sources

Component E-Journals E-Books Databases Electronic Theses & Dissertations (ETDs)
Meaning Scholarly periodicals published in electronic format, containing research articles and reviews. Digital versions of printed books or born-digital texts, readable on electronic devices. Structured electronic collections of bibliographic, full-text, numeric, or factual data. Digital versions of academic theses/dissertations submitted for degrees and stored online.
Characteristics - Peer-reviewed
- Updated frequently
- Hyperlinked references
- Remote and simultaneous access
- May include multimedia
- Portable and searchable
- Accessible on multiple devices
- Hyperlinks, annotations
- May include audio/video
- Easily downloadable
- Structured and indexed
- Types: bibliographic, full-text, numeric, factual
- Advanced search options
- Continuously updated
- Subscription-based
- Contain original research
- Stored in institutional/global repositories
- Searchable in full-text
- Promote open access
- Long-term preservation
Advantages - Latest research instantly available
- Easy keyword search
- Accessible anywhere
- Multiple users can access simultaneously
- Saves physical space
- Multiple users access the same book
- Portable & eco-friendly
- Useful for distance learning
- Saves time with powerful search
- Reliable and authoritative
- Comprehensive subject coverage
- Essential for citation tracking
- Provides detailed original research
- Freely accessible in repositories
- Prevents duplication of work
- Increases institutional visibility
Limitations - Expensive subscriptions
- Licensing restrictions
- Requires ICT infrastructure
- Sometimes bandwidth heavy
- Eye strain on screens
- DRM restrictions
- Subscription costs for some collections
- Dependent on the internet/devices
- Very costly subscriptions
- Require ICT & search skills
- Complex interfaces
- Loss of access after subscription ends
- Some ETDs under embargo
- Variable quality depending on institution
- Require indexing for easy retrieval
- ICT dependency
Examples (Global) JSTOR, ScienceDirect, Wiley Online Library Google Books, Project Gutenberg, Kindle Store Scopus, Web of Science, ProQuest, MEDLINE ProQuest Dissertations & Theses (PQDT), NDLTD
Examples (Indian) Current Science (IISc), IndianJournals.com, DOAJ (Open Access) National Digital Library of India (NDLI), ePGPathshala, NPTEL e-books IndMED (Medical sciences), CeRA (Agriculture), DELNET Shodhganga (INFLIBNET), Krishikosh (Agricultural theses)
Quick Revision Points - Online journals, peer-reviewed
- Updated faster than print
- Examples: JSTOR, Current Science
- Limitation: costly & license-bound
- Digital form of books
- Portable, searchable
- Examples: NDLI, Project Gutenberg
- Limitation: DRM & eye strain
- Structured data collections
- Types: bibliographic, full-text, numeric, factual
- Examples: Scopus, IndMED
- Limitation: costly & restricted
- Digital research works
- Original, detailed
- Examples: Shodhganga, ProQuest
- Limitation: embargo & variable quality