Levine, Stuart R.
Spektrum, 1996
Buku Teks
White, B. Joseph
American Management Association, 2007
eBooks
Sharma, Robin
Free Press, 2010
Buku Teks
Carnegie, Dale, 1888-1955
Gramedia Pustaka Utama, 2019
Buku Teks
Cole, Brent
Simon & Schuster, 2011
Buku Teks