APA-referens (7:e uppl.)

Ely, R. T., & Wicker, G. R. (1917). Elementary principles of economics: Together with a short sketch of economic history (Rev.). Macmillan.

Chicago-referens (17:e uppl.)

Ely, Richard Theodore, och George Ray Wicker. Elementary Principles of Economics: Together with a Short Sketch of Economic History. Rev. New York ; London: Macmillan, 1917.

MLA-referens (8:e uppl.)

Ely, Richard Theodore, och George Ray Wicker. Elementary Principles of Economics: Together with a Short Sketch of Economic History. Rev. Macmillan, 1917.