Kaplan, Abby, author
Cambridge University Press, 2016
Buku Teks
Patzer, Gordon L., author
American Management Association, 2008
eBooks
Calwell, Sue, author
Baca, 2006
Buku Teks
Quinn, Gerard, author
Studio Editions, 1990
Buku Referensi
Goleman, Daniel, author
Bantam Books, 2005
Buku Teks