Bruner, Jerome, author
John Wiley & Sons, 1956
Buku Teks
Johnson, Donald M., author
Harper and Row, 1972
Buku Teks
McGraw-Hill, 2006
Buku Teks
Thomson, Robert, author
Penguin Books, 1974
Buku Teks
Vinacke, Edgar W., author
McGraw-Hill, 1974
Buku Teks