Dyfyniad APA

Peterson, W. L. (1988). Principles of economics: Macro (6 edition.). Universal Book Stall.

Dyfyniad Arddull Chicago

Peterson, Willis L. Principles of Economics: Macro. 6 edition. New Delhi: Universal Book Stall, 1988.

Dyfyniad MLA

Peterson, Willis L. Principles of Economics: Macro. 6 edition. Universal Book Stall, 1988.

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