APA استشهاد

Silverman, H. A. . .. (1960). Substance of economics (15.). Sir Isaac Pitman & Sons Ltd.

استشهاد بنمط شيكاغو

Silverman, H A. Substance of Economics. 15. London: Sir Isaac Pitman & Sons Ltd, 1960.

MLA استشهاد

Silverman, H A. Substance of Economics. 15. Sir Isaac Pitman & Sons Ltd, 1960.