Ruskan, John
Random House, 1993
Buku Teks
Kaluzniacky, Eugene, author
IDEA Group, 2004
Buku Teks
Hatmodjo, Jono, author
Balai Pustaka, 2003
Buku Teks
Goleman, Daniel, author
Bantam Books, 1995
Buku Teks
edited by Lorraine Dacre-Pool, Pamela Qualter
Wiley, 2018
Buku Teks