Huber, Diane L., author
Saunders , 2010
Buku Teks
Hayes, James L., author
Amacom , 1983
Buku Teks
McCorkle, Chester O., author
Jossey-Bass Publishers, 1982
Buku Teks
Swansburg, Russell C., author
Jones and Bartlett, 1990
Buku Teks
Kelly, Patricia, author
Cengage Learning , 2012
Buku Teks