Dyfyniad APA

American Society of Agronomy. (1998). Publications handbook and style manual. American Society of Agronomy.

Dyfyniad Arddull Chicago

American Society of Agronomy. Publications Handbook and Style Manual. Wisconsin: American Society of Agronomy, 1998.

Dyfyniad MLA

American Society of Agronomy. Publications Handbook and Style Manual. American Society of Agronomy, 1998.

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