Santrock, John W., author
McGraw-Hill, 2000
Buku Teks
Santrock, John W., author
McGraw-Hill, 2003
Buku Teks
Roberts, Ann, author
Routledge, 2007
Buku Teks
Santrock, John W.
2003
Multimedia
Singer, Hans W. (Hans Wolfgang), author
United Nations, 1972
Buku Teks