APA (7th ed.) Citation

Gregson, K., Saffel, R. A., & Clark, J. A. (1987). Computer applications in agricultural environments. Butterworths.

Chicago Style (17th ed.) Citation

Gregson, K., R. A. Saffel, and J. A. Clark. Computer Applications in Agricultural Environments. London: Butterworths, 1987.

MLA (9th ed.) Citation

Gregson, K., et al. Computer Applications in Agricultural Environments. Butterworths, 1987.