LEAVITT HAROLD J. (2005). TOP DOWN: WHY HIERARCHIES ARE HEART? HARVARD BUSINESS SCHOOL PRESS.
Lua i Stíl Chicago (17ú heag.)LEAVITT HAROLD J. TOP DOWN: WHY HIERARCHIES ARE HEART? BOSTON: HARVARD BUSINESS SCHOOL PRESS, 2005.
Lua MLA (9ú heag.)LEAVITT HAROLD J. TOP DOWN: WHY HIERARCHIES ARE HEART? HARVARD BUSINESS SCHOOL PRESS, 2005.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.