Pfiffner, J. M., & Fels, M. (1964). Supervision of personnel. Prentice hall.
Chicago Style aipamenaPfiffner, John M., and Marshall Fels. Supervision of Personnel. New Jersey: Prentice hall, 1964.
MLA aipamenaPfiffner, John M., and Marshall Fels. Supervision of Personnel. Prentice hall, 1964.
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