Cita APA (7a ed.)

Simmonds, N., & Smartt, J. (1999). Principles of crop improvement (2nd edition.). Blackwell.

Cita Chicago Style (17a ed.)

Simmonds, N.W, y J. Smartt. Principles of Crop Improvement. 2nd edition. Oxford: Blackwell, 1999.

Cita MLA (8a ed.)

Simmonds, N.W, y J. Smartt. Principles of Crop Improvement. 2nd edition. Blackwell, 1999.