Robinson William A. (1997). Best Sales Promotions. NTC Books.
Lua i Stíl Chicago (17ú heag.)Robinson William A. Best Sales Promotions. USA: NTC Books, 1997.
Lua MLA (9ú heag.)Robinson William A. Best Sales Promotions. NTC Books, 1997.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.