Williams, D. L. (2014). Leaders at work. Wiley.
Lua i Stíl Chicago (17ú heag.)Williams, David L. Leaders at Work. [Somerset, New Jersey]: Wiley, 2014.
Lua MLA (9ú heag.)Williams, David L. Leaders at Work. Wiley, 2014.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.