Muchdis
Balai Pustaka, 1950
Buku Teks
Kurian, George Thomas
Amacom, 2013
Buku Referensi
Tobin, Daniel R., 1946-
American Management Association, 2008
eBooks
Dilenschneider, Robert L.
American Management Association, 2010
eBooks
Goldsmith, Marshall
American Management Association, 2010
eBooks