Bittel, L. R. (1968). What every supervisor should know (2nd ed.). McGraw-Hill.
Chicago Style aipamenaBittel, Lester R. What Every Supervisor Should Know. 2nd ed. New York: McGraw-Hill, 1968.
MLA aipamenaBittel, Lester R. What Every Supervisor Should Know. 2nd ed. McGraw-Hill, 1968.
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