| ABC-CLIO: Publisher of reference books, CD-ROM products, and research publications. |
| Bernan: Publisher of statistical and government references. Distributes information published by the U.S. government and international agencies. |
| Book Hunter Press: Publishes reference materials for book delears, including the Used Book Lover's Guides. |
| BRB Publications, Inc.: Offers products and services dedicated to searching and understanding of public records. |
| Citadel Data Net: Reference and consumer publishers. |
| Collins Cobuild: Publishes dictionaries and reference works for teachers and learners of English. |
| Dashofer Holding, Ltd.: International publisher of reference books, software, and newsletters. |
| EBSCO Information Services: Offers databases, electronic journals, books, and subscription services. |
| ETS Publishing House: Publishes Russian-English dictionaries. |
| Europa Publications: Publishes a series of regularly revised reference books that cover international affairs, politics, and economics. |
| Facts On File, Inc.: Publisher of print and electronic reference products for the school and library market. |
| Gale Group: Reference products for libraries, schools and businesses. |
| H.W. Wilson Company: Publisher of web, CD-ROM, and print references for librarians and researchers. |
| Helicon: Publisher of the Hutchinson Encyclopedias. |
| Institute for Scientific Information: Publishes scholarly research databases in the sciences, social sciences, and arts and humanities. |
| Kinship: Publishes books and CD-ROMs, including many New York State source records for genealogists. Also includes research suggestions. |
| Librairie du Liban Publishers: Offers monolingual, bilingual, and multilingual dictionaries, encylopedias, and books. |
| Libraries Unlimited: Publishes bibliographies and reference books, library science textbooks, information science materials, and practical handbooks, monographs, and manuals for library educators, librarians and teachers. |
| Marquis Who's Who: Publishes biography reference sources covering notable people throughout the world. |
| Marshall Cavendish Corporation: Publisher of illustrated reference and children's books. |
| McFarland & Company, Inc.: Publisher of scholarly and reference books. |
| Merriam-Webster: Publisher of American English dictionaries and reference sources. |
| Moschovitis Group: Information technology and reference publishing. |
| Primary Source Microfilm: Publisher of archival research materials researchers in the humanities and social sciences. |
| Quirk Books: Publishers of irreverent pop-culture, humor, 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 US ISBN agency. |
| Scholastic Library Publishing: Publisher of reference and non-fiction books for grades K-12. |
| Shogakukan, Inc.: Japanese publisher of dictionaries, educational, and other non-fiction and fiction works, including manga books. |
| The Visiting Fireman: Annual publication and reference book for fire buffing, and fire service enthusiasts. |
| Trident Press: Publishes reference books, including dictionaries, encyclopedias, and atlases. |
| Words@Random: Publishes references materials, including dictionaries, handbooks and encyclopedias. |
Classical
