Dyfyniad APA

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

Dyfyniad Arddull Chicago

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

Dyfyniad MLA

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

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.