Davison, Gerald C.
John Wiley & Sons, 1998
Buku Teks
Csikszentmihalyi, Mihaly, author
Springer, 2014
Buku Teks
Santrock, John W.
McGraw-Hill, 2003
Multimedia
Baron, Robert A., author
Simon & Schuster, 1992
Buku Teks
Gray, Peter, author
Worth Publishers, 1999
Buku Teks