APA (7th ed.) Citation

Simmonds, N., & Smartt, J. (1999). Principles of crop improvement (2rd ed.). Blackwell science.

Chicago Style (17th ed.) Citation

Simmonds, N.W, and J. Smartt. Principles of Crop Improvement. 2rd ed. Oxford ; Malden MA,USA: Blackwell science, 1999.

MLA (8th ed.) Citation

Simmonds, N.W, and J. Smartt. Principles of Crop Improvement. 2rd ed. Blackwell science, 1999.