Petri, H. L. (1991). Motivation: Theory, research and applications (3rd ed.). Wadsworth.
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Dyfyniad Arddull Chicago
Petri, Herbert L. Motivation: Theory, Research and Applications. 3rd ed. Belmont, California: Wadsworth, 1991.
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Dyfyniad MLA
Petri, Herbert L. Motivation: Theory, Research and Applications. 3rd ed. Wadsworth, 1991.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.