APA (7e ed.) Bronvermelding

Walker, F. A. (1887). Political economy (3rd ed.). Macmillan.

Chicago (17e ed.) Bronvermelding

Walker, Francis Amasa. Political Economy. 3rd ed. Lond.: Macmillan, 1887.

MLA (8e ed.) Bronvermelding

Walker, Francis Amasa. Political Economy. 3rd ed. Macmillan, 1887.