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Dyfyniad Arddull ChicagoGilmer, B. von Haller, Edward L. Deci, and Robert Glaser. Industrial and Organizational Psychology. 4th ed. New York: McGraw-Hill, 1977.
Dyfyniad MLAGilmer, B. von Haller, et al. Industrial and Organizational Psychology. 4th ed. McGraw-Hill, 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.