Dyfyniad APA

Dept. of Agriculture. (1970). Contours of change. [Washington: For sale by the Supt. of Docs..

Dyfyniad Arddull Chicago

Dept. of Agriculture. Contours of Change. [Washington: For sale by the Supt. of Docs., 1970.

Dyfyniad MLA

Dept. of Agriculture. Contours of Change. [Washington: For sale by the Supt. of Docs., 1970.

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