APA aipamena

Willis L Peterson. (1990). Principles of Economics: Macro (7th ed.). Universal.

Chicago Style aipamena

Willis L Peterson. Principles of Economics: Macro. 7th ed. New Delhi: Universal, 1990.

MLA aipamena

Willis L Peterson. Principles of Economics: Macro. 7th ed. Universal, 1990.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.