Stevens, R. (2000). Marketing planning guide. Jaico.
Lua i Stíl Chicago (17ú heag.)Stevens, Robert. Marketing Planning Guide. Mumbai: Jaico, 2000.
Lua MLA (9ú heag.)Stevens, Robert. Marketing Planning Guide. Jaico, 2000.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.