BITTEL, L. R. [., & RAMSEY, J. E. [. (1989). Encyclopedia of professional management (Ed. 2.). Grolier International.
Lua i Stíl Chicago (17ú heag.)BITTEL, Lester Robert [Ed.], agus Jackson E. [Ed.] RAMSEY. Encyclopedia of Professional Management. Ed. 2. Danbury: Grolier International, 1989.
Lua MLA (9ú heag.)BITTEL, Lester Robert [Ed.], agus Jackson E. [Ed.] RAMSEY. Encyclopedia of Professional Management. Ed. 2. Grolier International, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.