Timmins, Geoff, author
Sage, 2006
Buku Teks
Wilson, John A. R., author
McGraw-Hill, 1974
Buku Teks
National Training Laboratories Institute for Applied Behavioral Science
Institute for Applied Behavioral Science, 1968
Buku Teks
Donald Freeman and Jack C. Richardsand , author
Cambridge Cambridge University Press 1996
Buku Teks
Miguel A R B Castanho, editor
[, Springer], 2012
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