Citazione Stile APA (7a Edizione)

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

Citazione stile Chigago Style (17a edizione)

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

Citatione MLA (9a ed.)

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