Dyfyniad APA

Perkins, F., & Cohen, A. (2011). The Roosevelt I knew. New York: Penguin Books.

Dyfyniad Arddull Chicago

Perkins, Frances, and Adam Cohen. The Roosevelt I Knew. New York: Penguin Books, 2011.

Dyfyniad MLA

Perkins, Frances, and Adam Cohen. The Roosevelt I Knew. New York: Penguin Books, 2011.

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