Halsey, G. D. (1955). Selecting and developing first-line supervisors. Harper.
Dyfyniad Arddull ChicagoHalsey, George D. Selecting and Developing First-line Supervisors. New york: Harper, 1955.
Dyfyniad MLAHalsey, George D. Selecting and Developing First-line Supervisors. Harper, 1955.
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