Weinberg, Mike, author
[American Management Association, American Management Association], 2012
eBooks
Haneberg, Lisa, author
American Society for Training & Development, 2010
eBooks
Schneider, Louis, author
McGraw-Hill, 1975
Buku Teks
Michelson, William, author
Addison-Wesley Publishing , 1970
Buku Teks
Fatih University Publications, 2009
Buku Referensi