APA aipamena

Simmonds, N. (1979). Principles of crop improvement. Longman.

Chicago Style aipamena

Simmonds, N.W. Principles of Crop Improvement. Longman, 1979.

MLA aipamena

Simmonds, N.W. Principles of Crop Improvement. Longman, 1979.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.