Stryker, Perrin, editor
Harper & Row, [date of publication not identified]
Buku Teks
Stuyck, Raymond
Brito, 1972
Buku Teks
Russell, Susan, author
[American Society for Training and Development Press, American Society for Training and Development Press], 1999
eBooks
Loring, Rosalind
Van Nostrand Reinhold Co, 1972
Buku Teks
Zichy, Shoya, author
McGraw-Hill , 2001
Buku Teks