Alan Lewis
Cambridge University Press, 2018
eBooks
Santrock, John W.
McGraw-Hill, 2003
Multimedia
Burton, Lorelle
John Wiley & Sons Australia, 2009
Buku Teks
Baron, Robert A.
Simon & Schuster, 1992
Buku Teks
Gray, Peter
Worth Publishers, 1999
Buku Teks