APA (7e ed.) Bronvermelding

Enis, B. M. (1980). Marketing principles (3rd ed.). Goodyear Pub.

Chicago (17e ed.) Bronvermelding

Enis, Ben M. Marketing Principles. 3rd ed. Sta. Monica, Calif: Goodyear Pub, 1980.

MLA (9e ed.) Bronvermelding

Enis, Ben M. Marketing Principles. 3rd ed. Goodyear Pub, 1980.