APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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