edited by Linda M. Whiteford and Marilyn L. Poland
Westview Press, 1989
Buku Teks
Goleman, Daniel
Bantam Dell, 2006
Buku Teks
Brown, Theodore L.
Prentice-Hall, 2000
Buku Teks
Brown, Theodore L.
Prentice-Hall, 2000
Buku Teks
Keith, Arthur, Sir
Watts & Co., 1950
Buku Teks