APA (7th ed.) Citation

Hay, R. K. M. ., Hay, R. K. M. ., & Porter, J. R. . [. (2006). The physiology of crop yield (2nd ed.). Blackwell Publishing.

Chicago Style (17th ed.) Citation

Hay, Robert K. M. , Robert K. M. Hay, and John R. [] Porter. The Physiology of Crop Yield. 2nd ed. Oxford ; Ames, Iowa: Blackwell Publishing, 2006.

MLA (9th ed.) Citation

Hay, Robert K. M. , et al. The Physiology of Crop Yield. 2nd ed. Blackwell Publishing, 2006.