APA استشهاد

Marshall , A. (1920). Principles of economics (8th ed.). Macmillan.

استشهاد بنمط شيكاغو

Marshall , Alfred. Principles of Economics. 8th ed. London: Macmillan, 1920.

MLA استشهاد

Marshall , Alfred. Principles of Economics. 8th ed. Macmillan, 1920.