APA (7th ed.) Citation

Gilbert, P., & Hamilton, C. J. (1990). Entomology: A guide to information sources (2nd ed.). Mansell.

Chicago Style (17th ed.) Citation

Gilbert, Pamela, and Chris J. Hamilton. Entomology: A Guide to Information Sources. 2nd ed. London [etc.]: Mansell, 1990.

MLA (9th ed.) Citation

Gilbert, Pamela, and Chris J. Hamilton. Entomology: A Guide to Information Sources. 2nd ed. Mansell, 1990.