Evans, G. R. (Gillian Rosemary), author
Open University Press, 2002
Buku Teks
Kvern, Martin Olav, author
Macromedia Press, 1998
Buku Teks
Sargent III, Murray, author
Addison-Wesley, 1981
Buku Teks
Steinhoff, Dan, author
McGraw-Hill, 1979
Buku Teks
Smith, Jim, author
American Society for Training & Development, 2008
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