APA-referens (7:e uppl.)

Walker, F. A. (1892). Political economy. H. Holt and company.

Chicago-referens (17:e uppl.)

Walker, Francis Amasa. Political Economy. New York: H. Holt and company, 1892.

MLA-referens (8:e uppl.)

Walker, Francis Amasa. Political Economy. H. Holt and company, 1892.