Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Hay, Robert K. M., y John R. Porter. The Physiology of Crop Yield. 2nd ed. Oxford, UK [etc.]: Blackwell, 2006.

Cita MLA (9a ed.)

Hay, Robert K. M., y John R. Porter. The Physiology of Crop Yield. 2nd ed. Blackwell, 2006.