Cambridge University Press, 2004
Buku Teks
Smith, H.W., author
Prentice-Hall, 1981
Buku Teks
edited by Fred A. Stitt
McGraw-Hill, 1999
Buku Teks
Stitt, Fred A., editor
McGraw-Hill, 1999
Buku Referensi
Churchill, Gilbert A., author
The Dryden Press, 1995
Buku Teks