Dyfyniad APA

Case, K. (2002). Principles of economics (6th.). Pearson Education.

Dyfyniad Arddull Chicago

Case, Karl. Principles of Economics. 6th. Delhi: Pearson Education, 2002.

Dyfyniad MLA

Case, Karl. Principles of Economics. 6th. Pearson Education, 2002.

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