Dyfyniad APA

Sparks, D. L. (2001). Advances in agronomy. San Diego: Academic Press.

Dyfyniad Arddull Chicago

Sparks, Donald L. Advances in Agronomy. San Diego: Academic Press, 2001.

Dyfyniad MLA

Sparks, Donald L. Advances in Agronomy. San Diego: Academic Press, 2001.

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