Dyfyniad APA

Roll, E. (1993). History of economic thought (5th rev. ed.). Rupa.

Dyfyniad Arddull Chicago

Roll, Eric. History of Economic Thought. 5th rev. ed. New Delhi: Rupa, 1993.

Dyfyniad MLA

Roll, Eric. History of Economic Thought. 5th rev. ed. Rupa, 1993.

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