Bee, Helen L., author
Allyn and Bacon, 2010
Buku Teks
Furlong, Monica, author
Alfred A. Knopf, 1987
Buku Teks
E. Mavis Hetherington
Buku Teks
Johnston, Peter, author
Churchile Livingstone, 2003
Buku Teks
Santrock, John W., author
McGraw-Hill, 1998
Buku Teks