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| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
- I/B/E/S
- Thomson Financial
- I/B/E/S
- See: Wharton Research Data Services - WRDS
- IDS Pay Report
- Incomes Data Services Ltd
- IEA Data
- See: ESDS International
- IEEE Xplore
- IEEE Xplore
- IHS
- See: Info4education
- ILO Key Indicators of the Labour Market
- See: ESDS International
- IMF Data
- See: ESDS International
- InCites
- Thomson Reuters
- Incomes Data Services
- See: IDS Pay Report
- Incyte's Proteome Bioknowledge Library
- See: Proteome Bioknowledge Library
- Independent Local Radio Programme Sharing Scheme 1983 to 1990
- British Universities Film & Video Council
- Index Islamicus
- ProQuest
- Index to Foreign Legal Periodicals
- Ovid Online
- Index to Legal Periodicals
- See: LexisLibrary
- Index to Nineteenth Century American Art Periodicals
- See: FirstSearch
- Index to Periodicals Related to Law
- See: Heinonline
- Index to Printed Music
- EBSCO
- Index to Theses
- Expert Information
- Index Translationum
- United Nations Educational, Scientific and Cultural Organization
- Info4Education
- IHS
- INSPEC
- Engineering Village 2
- International Encyclopedia of Communication
- See: Blackwell Reference Online
- International Medieval Bibliography
- Brepolis
- International Pharmaceutical Abstracts
- Ovid Online
- International Tables for Crystallography
- IUCr / Springer
- Internurse
- Internurse
- Investext Plus
- See: Thomson Research
- IRIS - Legal Observations of the European Audiovisual Observatory
- European Audiovisual Observatory
- iSinolaw
- iSinolaw
- ISSM (The Institute for the Study of Security Markets)
- See: Wharton Research Data Services - WRDS
- IvyDB
- See: Wharton Research Data Service - WRDS