Dyfyniad APA

Roll, E. (1973). History of Economic Thought (4th ed.). Faber and Faber.

Dyfyniad Arddull Chicago

Roll, Eric. History of Economic Thought. 4th ed. London: Faber and Faber, 1973.

Dyfyniad MLA

Roll, Eric. History of Economic Thought. 4th ed. Faber and Faber, 1973.

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