APA (7th ed.) Zitazioa

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

Chicago Style (17th ed.) Zitazioa

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

MLA (9th ed.) Zitazioa

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