Robinson, Dana Gaines, author
American Society for Training & Development Press, 2000
eBooks
Leavitt, Fred, author
C. Brown Publishers , 1991
Buku Teks SO
Pittenger, David J., author
McGraw-Hill, 2003
Buku Teks
Cozby, Paul C.
McGraw-Hill, Higher Education, 2008
Buku Teks
Sommer, Robert, author
New York, 2002
Buku Teks