Cooper, R. K. (1999). Executive EQ. Gramedia Pustaka Utama.
Lua i Stíl Chicago (17ú heag.)Cooper, Robert K. Executive EQ. Gramedia Pustaka Utama, 1999.
Lua MLA (8ú heag.)Cooper, Robert K. Executive EQ. Gramedia Pustaka Utama, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.