R.G.H. Siu
McGraw-Hill, 1980
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Webber, Ross A., author
Richard D. Irwin, 1981
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Migliorino, P.
Australian Government Publishing service, 1994
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Knudson, Harry R.
McGraw-Hill Kogakusha, 1979
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Estep, Tora, author
American Society for Training & Development, 2006
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