Dyfyniad APA

Ahlgren, G. H., Kingman, G. C., & Wolf, D. E. (1951). Principles of weed control. John Wiley & Sons INC.

Dyfyniad Arddull Chicago

Ahlgren, Gilbert H., Glenn C. Kingman, and Dale E. Wolf. Principles of Weed Control. NewYork: John Wiley & Sons INC, 1951.

Dyfyniad MLA

Ahlgren, Gilbert H., et al. Principles of Weed Control. John Wiley & Sons INC, 1951.

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