Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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