Schur, Lee David, author
Addison-Wesley, 1973
Buku Teks
Alam, S.S., author
Oxford and IBH, 1988
Buku Teks
Rice, John K., author
Holt, Rinehart and Winston , 1973
Buku Teks
Zelle, John, author
Franklin, Beedle and Associates, 2010
Buku Teks
Biggs, Norman L., author
Clarendon Press, 1989
Buku Teks