Greene, Judith, author
Methuen , 1975
Buku Teks
Eckel, Bruce, author
Prentice-Hall, 2006
Buku Teks
Bruner, Jerome, author
John Wiley & Sons, 1956
Buku Teks
Thomson, Robert, author
Penguin Books, 1974
Buku Teks
Moore, Brooke Noel, author
McGraw-Hill, 2004
Buku Teks