- ABC-CLIO
 - Publisher of reference books, CD-ROM products, and research publications. - Bernan
- Publisher of original statistical and government references. Also distributes information published by the U.S. government and international agencies.
- Berry Company, The
- Nationwide publisher of yellow pages and related services.
- Book Hunter Press
- Publishers of the Used Book Lover's Guides to used booksellers in the United States and Canada.
- Bowker-Saur@
 CBD Research
- Independent publisher of reference books and CD-ROMS. Also home of Chancery House Press. Condor Publishers (Ireland) Ltd
- Produces 3D pictorial maps, information units for outdoor display, corporate brochures, and advertising materials.- EBSCO Publishing
- Offers databases to organise electronic journals, books, and subscriptions.
- ETS Publishing House
- Publishing and selling Russian-English electronic and traditional dictionaries.
- Europa Publications
- Publishes a series of regularly revised reference books that cover international affairs, politics, and economics.
- Facts On File, Inc.
- Publisher of reference books and reference material in other media.
- Fitzroy Dearborn Publishers
- Publisher of reference books for libraries of all levels.
- Fredrick Warne and Co. Ltd.
- Contains brief history and list of the Observor Books Series as well as editions wanted by members of The Observer Pocket Series Collectors Society.
- Gale (3)
- Learn about Gale from Farmington Hills, Michigan, publishers of reference information for libraries, schools, and businesses. Sites include their divisions, Visible Ink Press and Primary Source Microfilm.
- Grolier Electronic Publishing, Inc. (3)
- Grup Enciclopèdia Catalana
- Offers encyclopedias, dictionaries, literary series, and children's books.
- H. W. Wilson
- Publisher of web, CD-ROM, and print references for librarians and researchers worldwide.
- Helicon Publishing Ltd
- Innovative reference publishing company and pioneer of electronic and multimedia products.
- Institute for Scientific Information - ISI (3)
- Kinship
- Genealogy records and reference publications especially for New York.
- Librairie du Liban Publishers
- Offers monolingual, bilingual, and multilingual dictionaries and encylopedias.
- Libraries Unlimited@
- Marquis Who's Who
- Biographies from notables throughout the world.
- Marshall Cavendish Corporation
- Publisher of illustrated reference books and children's books.
- McFarland & Company, Inc., Publishers
- Publisher of scholarly and reference books, specialising in library sales.
- Merriam-Webster
![[*]](http://eur.i1.yimg.com/eur.yimg.com/i/uk/g/rating2.gif) - Free online version of the Merriam-Webster English dictionary, with searchable dictionary definitions, thesaurus, and a student dictionary for kids. Also offers online subscription versions of Merriam-Webster's collegiate dictionary and the Encyclopedia Britannica. - Moschovitis Group
- Information technology and reference publishing divisions.
- Moyer Bell Publishers
- Poetry, literature, non-fiction, fine and decorative arts, and reference.
- Optima Books
- Publisher of books on slang and idioms and the Street Talk series, for the non-native English speaker.
- Primary Source Microfilm
- Publisher of archival research materials for students and researchers in the humanities and social sciences.
- Public Record Research Library
- Our books tell you how and where to look for public records of all types. 10+ Sourcebooks detailing locations of criminal, civil records etc.
- Quirk Books
- Focuses on irreverent pop-culture, humour, gift, self-help, and "impractical" reference books.
- R.R. Bowker
- Publishes reference products such as Publishers Trade List Annual, Books in Print, and Ulrich's International Periodicals Directory. Serves as official U.S. ISBN agency.
- Shogakukan, Inc.
- Japanese publisher of dictionaries, educational, and other non-fiction and fiction works, including manga, or comic books.
- Trident Press International
- Reference and children's reference books.
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