CERTO, S. C. (2003). Modern management [ada CD]. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)CERTO, Samuel C. Modern Management [ada CD]. Prentice Hall, 2003.
Lua MLA (8ú heag.)CERTO, Samuel C. Modern Management [ada CD]. Prentice Hall, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.