Caplovitz, David, author
Free Press; Collier-Macmillan, 1967
Buku Teks
Goleman, Daniel, author
Bantam Books, 2006
Buku Teks
Goleman, Daniel, author
Bantam books, 2006
Buku Teks
Patzer, Gordon L., author
American Management Association, 2008
eBooks
Goleman, Daniel, author
Bantam Books, 2005
Buku Teks