BENNETT ROGER. (1989). PERSONAL EFFECTIVENESS. KOGAN PAGE.
Lua i Stíl Chicago (17ú heag.)BENNETT ROGER. PERSONAL EFFECTIVENESS. LONDON: KOGAN PAGE, 1989.
Lua MLA (9ú heag.)BENNETT ROGER. PERSONAL EFFECTIVENESS. KOGAN PAGE, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.