Beckman, R. O. (1952). How to train supervisors; manual and outlines for determinate discussion (4th rev. ed.). Harper.
Cita Chicago Style (17a ed.)Beckman, R O. How to Train Supervisors; Manual and Outlines for Determinate Discussion. 4th rev. ed. New York: Harper, 1952.
Cita MLA (9a ed.)Beckman, R O. How to Train Supervisors; Manual and Outlines for Determinate Discussion. 4th rev. ed. Harper, 1952.
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