Goleman, Daniel
Bantam Dell, 2006
Buku Teks
Brown, Theodore L.
Prentice-Hall, 2000
Buku Teks
Brown, Theodore L.
Prentice-Hall, 2000
Buku Teks
Westview Press , 1989
Buku Teks
general editor: Thomas McCracken ; contributing editor: Richard Walker ; foreword: John F. Morris
Lustre Press, 1999
Buku Referensi