APA (7th ed.) Citation

Dyer, H., & Gunson, A. (1990). A directory of library and information retrieval software for microcomputers (4th ed.). Gower Publishing Company Limited.

Chicago Style (17th ed.) Citation

Dyer, Hilary, and Alison Gunson. A Directory of Library and Information Retrieval Software for Microcomputers. 4th ed. Aldershot: Gower Publishing Company Limited, 1990.

MLA (8th ed.) Citation

Dyer, Hilary, and Alison Gunson. A Directory of Library and Information Retrieval Software for Microcomputers. 4th ed. Gower Publishing Company Limited, 1990.