BROWNSTONE D M. (1983). SALES PROFESSIONALS ADVISOR. JOHN WILEY AND SONS.
Lua i Stíl Chicago (17ú heag.)BROWNSTONE D M. SALES PROFESSIONALS ADVISOR. NEW YORK: JOHN WILEY AND SONS, 1983.
Lua MLA (9ú heag.)BROWNSTONE D M. SALES PROFESSIONALS ADVISOR. JOHN WILEY AND SONS, 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.