APA (7th ed.) Citation

NetLibrary, Inc, Patterson, A. G., & Leach, P. M. (1989). Index to American reference books annual 1985-1989: A cumulative index to subjects, authors, and titles. Libraries Unlimited.

Chicago Style (17th ed.) Citation

NetLibrary, Inc, Anna Grace Patterson, and Patricia M. Leach. Index to American Reference Books Annual 1985-1989: A Cumulative Index to Subjects, Authors, and Titles. Englewood, Colo.: Libraries Unlimited, 1989.

MLA (9th ed.) Citation

NetLibrary, Inc, et al. Index to American Reference Books Annual 1985-1989: A Cumulative Index to Subjects, Authors, and Titles. Libraries Unlimited, 1989.