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