Futrell, C. (1989). ABC's of selling (2nd ed.). Irwin.
Lua i Stíl Chicago (17ú heag.)Futrell, Charles. ABC's of Selling. 2nd ed. Homewood, Ill.: Irwin, 1989.
Lua MLA (9ú heag.)Futrell, Charles. ABC's of Selling. 2nd ed. Irwin, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.