Fodor, John T.
The Williams & Willkins, 1995
Buku Teks
Dunlop, J.
Chapman & Hall, c1994
Buku Teks
Overman, Michael
Lutterworth Press, 1974
Buku Teks
Hioki, Warren, author
Prentice-Hall, 1998
Buku Teks
Martin, James, author
Prentice-Hall, 1977
Buku Teks