APA-referens (7:e uppl.)

Parker, U. S. (1920). Elements of economics for high schools (Rev. ed.). Irwin printing co..

Chicago-referens (17:e uppl.)

Parker, Ulysses Simpson. Elements of Economics for High Schools. Rev. ed. [Quincy, Ill.: Irwin printing co., 1920.

MLA-referens (8:e uppl.)

Parker, Ulysses Simpson. Elements of Economics for High Schools. Rev. ed. Irwin printing co., 1920.