APA (7th ed.) Citation

Hardy, K. G. (1981). Bacterial plasmids. [publisher not identified].

Chicago Style (17th ed.) Citation

Hardy, K. G. Bacterial Plasmids. Washington, D. C. : American Society for Microbiology: [publisher not identified], 1981.

MLA (9th ed.) Citation

Hardy, K. G. Bacterial Plasmids. [publisher not identified], 1981.