ARMSTRONG, M. (1994). Performance Management. Tugu Publisher.
Lua i Stíl Chicago (17ú heag.)ARMSTRONG, Michael. Performance Management. Tugu Publisher, 1994.
Lua MLA (8ú heag.)ARMSTRONG, Michael. Performance Management. Tugu Publisher, 1994.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.