Perreault, W. D. (1997). Essentials of marketing: A global-managerial approach (7th.ed.). Irwin.
Lua i Stíl Chicago (17ú heag.)Perreault, William D. Essentials of Marketing: A Global-managerial Approach. 7th.ed. Chicago: Irwin, 1997.
Lua MLA (9ú heag.)Perreault, William D. Essentials of Marketing: A Global-managerial Approach. 7th.ed. Irwin, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.