Colin, Virginia L
McGraw-Hill , 1996
Buku Teks
Raeff, Catherine, author
Oxford University Press, 2016
eBooks
Hofer, Myron A
W.H. Freeman and Company , 1981
Buku Teks
Papalia, Diane E., author
Salemba Empat, 2009
Buku Teks
Gesell, Arnold, author
Harper & Row, 1949
Buku Teks