APA (7th ed.) Zitazioa

Byrns, R. T. (1981). Economics. Foresman.

Chicago Style (17th ed.) Zitazioa

Byrns, Ralph T. Economics. Glenview: Foresman, 1981.

MLA (9th ed.) Zitazioa

Byrns, Ralph T. Economics. Foresman, 1981.