Viki, Tendayi, author
Management Impact, 2017
Buku Teks
Kellett, Mary, author
Paul Chapman Publishing, 2005
Buku Teks
German-Grapes, Joan, author
Probus Publishing Company, 1994
Buku Referensi
Rothwell, William J., 1951-, author
American Management Association, 2010
eBooks
Caruso, David R., author
Jossey-Bass, 2004
Buku Teks