Cita APA (7th ed.)
Silk, L. (1974). The economists. Avon.
Cita Chicago (17th ed.)
Silk, Leonard. The Economists. New York: Avon, 1974.
Cita MLA (9th ed.)
Silk, Leonard. The Economists. Avon, 1974.
Atenció: Aquestes cites poden no estar 100% correctes.