Dyfyniad APA

United States. (1964). Department of Agriculture.

Dyfyniad Arddull Chicago

United States. Department of Agriculture. New Delhi, 1964.

Dyfyniad MLA

United States. Department of Agriculture. 1964.

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