John Wiley & Sons, 1987
Buku Teks
Heimstra, Norman W.
Brooks/Cole, 1978
Buku Teks
Santrock, John W.
McGraw-Hill, 2003
Multimedia
Burton, Lorelle, author
John Wiley & Sons Australia, 2009
Buku Teks
Baron, Robert A., author
Simon & Schuster, 1992
Buku Teks