Metzger, Norman
Aspen Publication, 1983
Buku Teks
Pynes, Joan
Jossey-Bass, 2011
Buku Teks
McConnell, Charles R.
Jones & Bartlett Learning, 2013
Buku Referensi
Niles, Nancy J
Jones and Bartlett Publishers, 2013
Buku Teks
edited by S. Robert Hernandez, Stephen J.O.Connor
Delmar/Cengage Learning, 2010
Buku Teks