Dyfyniad APA

(2004). Ideas that have worked. Viking.

Dyfyniad Arddull Chicago

Ideas That Have Worked. New Delhi: Viking, 2004.

Dyfyniad MLA

Ideas That Have Worked. Viking, 2004.

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