Still Richard R. (1988). Sales Management (5th.). PHI.
Lua i Stíl Chicago (17ú heag.)Still Richard R. Sales Management. 5th. New Delhi: PHI, 1988.
Lua MLA (9ú heag.)Still Richard R. Sales Management. 5th. PHI, 1988.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.