Gordon, Rachel Singer
Information Today, Inc., 2003
Buku Teks
Ullman, Jeffrey D., 1942-
Prentice-Hall, 1997
Buku Teks
Ullman, Jeffrey D., 1942-
Prentice-Hall, 1997
Buku Teks
Schweber, William
Prentice-Hall, 1996
Buku Teks
Piskurich, George M.
American Society for Training and Development, 2006
eBooks