Byrns, R. T. (1981). Economics. Foresman.
Cita Chicago (17th ed.)Byrns, Ralph T. Economics. Glenview: Foresman, 1981.
Cita MLA (9th ed.)Byrns, Ralph T. Economics. Foresman, 1981.
Atenció: Aquestes cites poden no estar 100% correctes.
Cita APA (7th ed.)