Dyfyniad APA

Dept. of Agriculture. (1967). Outdoors USA. [Washington: The United States Government Printing Office.

Dyfyniad Arddull Chicago

Dept. of Agriculture. Outdoors USA. [Washington: The United States Government Printing Office, 1967.

Dyfyniad MLA

Dept. of Agriculture. Outdoors USA. [Washington: The United States Government Printing Office, 1967.

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