ENCYCLOPEDIA OF PROFESSIONAL. & BITTEL, L. R. e. [. (1978). Encyclopedia of professional management/editor Lester Robert Bittel et.al. Grolier International.
Lua i Stíl Chicago (17ú heag.)ENCYCLOPEDIA OF PROFESSIONAL. agus Lester Robert et.al [ed] BITTEL. Encyclopedia of Professional Management/editor Lester Robert Bittel Et.al. Danbury: Grolier International, 1978.
Lua MLA (9ú heag.)ENCYCLOPEDIA OF PROFESSIONAL. agus Lester Robert et.al [ed] BITTEL. Encyclopedia of Professional Management/editor Lester Robert Bittel Et.al. Grolier International, 1978.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.