RUSSELL, F. A. (1978). Textbook Of Salesmanship Frederic A. Russell ; Frank H. Beach And Richard H. Buskirk. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)RUSSELL, Frederic A. Textbook Of Salesmanship Frederic A. Russell ; Frank H. Beach And Richard H. Buskirk. McGraw-Hill, 1978.
Lua MLA (8ú heag.)RUSSELL, Frederic A. Textbook Of Salesmanship Frederic A. Russell ; Frank H. Beach And Richard H. Buskirk. McGraw-Hill, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.