APA (7th ed.) Citation

Marshall, A. (1920). Principles of economics: An introductory volume (8th ed.). MacMillan.

Chicago Style (17th ed.) Citation

Marshall, Alfred. Principles of Economics: An Introductory Volume. 8th ed. Houndmills, England: MacMillan, 1920.

MLA (9th ed.) Citation

Marshall, Alfred. Principles of Economics: An Introductory Volume. 8th ed. MacMillan, 1920.

Warning: These citations may not always be 100% accurate.