Vasta, Ross, author
John Wiley & Sons, 2004
Buku Teks
Hurlock, Elizabeth Bergner, 1898-, author
McGraw-Hill Kogakusha, 1972
Buku Teks
Papalia, Diane E.
McGraw-Hill, 2006
Multimedia
Psychology Press, 1998
Buku Teks
Vasta, Ross, author
John Wiley & Sons, 1999
Buku Teks