APA Citatie

Frye, R. W. (1973). Introduction to the marketing system. Comfield press, 1973.

Chicago Style citaat

Frye, Robert W. Introduction to the Marketing System. Francisco: Comfield press, 1973, 1973.

MLA citatie

Frye, Robert W. Introduction to the Marketing System. Comfield press, 1973, 1973.