ENCYCLOPEDIA OF PROFESSIONAL. & BITTEL, L. R. e. [. (1978). Encyclopedia of professional management/editor Lester Robert Bittel et.al. Grolier International.
Cita Chicago (17th ed.)ENCYCLOPEDIA OF PROFESSIONAL. i Lester Robert et.al [ed] BITTEL. Encyclopedia of Professional Management/editor Lester Robert Bittel Et.al. Danbury: Grolier International, 1978.
Cita MLA (9th ed.)ENCYCLOPEDIA OF PROFESSIONAL. i Lester Robert et.al [ed] BITTEL. Encyclopedia of Professional Management/editor Lester Robert Bittel Et.al. Grolier International, 1978.
Atenció: Aquestes cites poden no estar 100% correctes.