Dyfyniad APA

(1993). Advances in agronomy; Vol. 49. London: Academic Press.

Dyfyniad Arddull Chicago

Advances in Agronomy; Vol. 49. London: Academic Press, 1993.

Dyfyniad MLA

Advances in Agronomy; Vol. 49. London: Academic Press, 1993.

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