Dyfyniad APA

Perkins, D. (1969). Yield of the Years. Little, Brown.

Dyfyniad Arddull Chicago

Perkins, Dexter. Yield of the Years. Boston: Little, Brown, 1969.

Dyfyniad MLA

Perkins, Dexter. Yield of the Years. Little, Brown, 1969.

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