APA (7th ed.) Citation

Hughes, P. E., & Varley, M. A. (1980). Reproduction in the pig. Butterworth.

Chicago Style (17th ed.) Citation

Hughes, P. E., and M. A. Varley. Reproduction in the Pig. London: Butterworth, 1980.

MLA (9th ed.) Citation

Hughes, P. E., and M. A. Varley. Reproduction in the Pig. Butterworth, 1980.

Warning: These citations may not always be 100% accurate.