Stapleton, John
Gower Press, 1974
Buku Teks
Schenk, George
Buku Teks
Bender, K. Joan, author
[American Society for Training & Development Press;, ], 2003
eBooks
Turock, Betty J., author
Neal-Schuman Publishers, 1992
Buku Teks
Boylen, Margaret
Random House, 1961
Buku Teks