Altman, Nathaniel, author
Healing Arts Press, 2000
Buku Teks
Megginson, William L, Mary Jane Byrd, Charles R. Scott, Leon C. Megginson
Irwin, 1997
Buku Referensi
Becker, Joanne M., author
Delmar Cengage Learning, 2010
Buku Teks
Becker, Joanne M
Delmar Cengage Learning, 2010
Multimedia
Biech, Elaine, author
ASTD press, 2009
Buku Teks