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- ABELL - Annual Bibliography of English Language and Literature
- Literature Online
- ABI Inform Global
- ProQuest
- ABI Inform Trade & Industry
- ProQuest
- Abstracts in Anthropology
- Baywood Publishing
- Academic Library
- Pluto Press
- Access World News
- NewsBank
- ACLS Humanities ebook
- American Council of Learned Societies
- Acta Sanctorum
- Acta Sanctorum
- Active Library on Corrosion
- Elsevier / NACE
- African American Experience
- ABC-CLIO
- African-American Poetry
- Literature Online
- Age Info
- Age Info
- Agricola
- National Agricultural Library
- AHFS Drug Information
- MedicinesComplete
- AIP Conference Proceedings
- American Institute of Physics
- All England Law Reports
- See: LexisLibrary
- Amadeus (Bureau van Dijk)
- See: Wharton Research Data Services - WRDS
- American Drama 1714-1915
- Literature Online
- American Film Institute (AFI) Catalog
- See: Film Indexes Online
- American Institute of Physics Conference Proceedings
- See: AIP Conference Proceedings
- American National Biography
- Oxford University Press
- American Poetry
- Literature Online
- American Society for Microbiology
- American Society for Microbiology
- Analytical WebBase
- Royal Society of Chemistry
- Annee Philologique
- Societe Internationale de Bibliographie Classique
- Annual Bibliography of English Language and Literature
- See: ABELL
- Annual Register
- Chadwyck-Healey
- Anthropology Plus
- See: FirstSearch
- AnthroSource
- American Anthropolological Association
- Apabi Digital Library
- Apabi
- Aqualine
- ProQuest
- Archival Sound Recordings
- British Library
- Archives Hub
- MIMAS
- Arcitext
- See: UKPressOnline
- Arden Shakespeare
- See: Shakespeare Collection
- Art Full Text
- EBSCO
- ARTbibliographies Modern (ABM)
- ProQuest
- Arts and Humanties Citation Index
- See: Web of Knowledge
- ARTstor
- ARTstor
- ASLIB Index to Theses
- See: Index to Theses
- ASSIA - Applied Social Sciences Index & Abstracts
- See: Applied Social Sciences Index and Abstracts
- ATLA Religion Index and ATLAS
- Ovid Online
- Atlas of North American English
- Mouton de Gruyter
- Audiovisual Library of International Law
- United Nations
- Australian Education Index
- ProQuest Dialog DataStar