Crain, William C, author
Prentice-Hall, 2005
Buku Teks
Crandell, Thomas L.
McGraw-Hill, Higher Education, 2009
Buku Teks
Santrock, John W., author
McGraw-Hill, 2009
Buku Teks
Crandell, Thomas L., author
McGraw-Hill, 2012
Buku Teks
Santrock, John W., author
Erlangga, 2012
Buku Teks