Howard, J. A. (1965). Marketing theory. Allyn and Bacon.
Lua i Stíl Chicago (17ú heag.)Howard, John A. Marketing Theory. Boston: Allyn and Bacon, 1965.
Lua MLA (9ú heag.)Howard, John A. Marketing Theory. Allyn and Bacon, 1965.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.