Flim, Else
Manteau, 1994
Buku Teks
Callahan, Madelyn
[American Society for Training and Development Press, American Society for Training and Development Press], 2006
eBooks
Jacoby, Tamar
Free Press, 1998
Buku Teks
Schnitzler, Arthur
Fischer, 1981
Buku Teks
Watt, Roger
Sage, 2019
Buku Teks