Dyfyniad APA

Leonard, W. H., & Martin, J. H. Principles of field crop prodction.

Dyfyniad Arddull Chicago

Leonard, Warren H., and John H. Martin. Principles of Field Crop Prodction.

Dyfyniad MLA

Leonard, Warren H., and John H. Martin. Principles of Field Crop Prodction.

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