ENCYCLOPEDIA OF PROFESSIONAL. & BITTEL, L. R. e. [. (1978). Encyclopedia of professional management/editor Lester Robert Bittel et.al. Grolier International.
Chicago-viite (17. p.)ENCYCLOPEDIA OF PROFESSIONAL. ja Lester Robert et.al [ed] BITTEL. Encyclopedia of Professional Management/editor Lester Robert Bittel Et.al. Danbury: Grolier International, 1978.
MLA-viite (9. p.)ENCYCLOPEDIA OF PROFESSIONAL. ja Lester Robert et.al [ed] BITTEL. Encyclopedia of Professional Management/editor Lester Robert Bittel Et.al. Grolier International, 1978.
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