Cita APA (7th ed.)

Spiegel, H. W. (1971). The growth of economic thought. Duke U.Pr.

Cita Chicago (17th ed.)

Spiegel, Henry William. The Growth of Economic Thought. Durham: Duke U.Pr, 1971.

Cita MLA (9th ed.)

Spiegel, Henry William. The Growth of Economic Thought. Duke U.Pr, 1971.