APA Edition Citation

Hay, R. K. M., & Walker, A. j. Introduction to the physiology of crop yield. Longman scientific & Technical.

Chicago Edition Citation

Hay, Robert K M., and Andrew j. Walker. Introduction to the Physiology of Crop Yield. London: Longman scientific & Technical.

MLA Edition Citation

Hay, Robert K M., and Andrew j. Walker. Introduction to the Physiology of Crop Yield. Longman scientific & Technical.