Dyfyniad APA

Webster, G. C. (1959). Nitrogen metabolism in plants. Row peterson and Co.

Dyfyniad Arddull Chicago

Webster, George C. Nitrogen Metabolism in Plants. Illinois: Row peterson and Co, 1959.

Dyfyniad MLA

Webster, George C. Nitrogen Metabolism in Plants. Row peterson and Co, 1959.

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