Graham, Billy
World Wide Publications, 1984
Buku Teks
Fuller, Gordon
Addison-Wesley, 1986
Buku Teks
Holt Rinehart and Winston, 1972
Buku Teks
Baldwin, J., author
John Wiley & Sons, 1996
Buku Teks
Fuller, Peter
University of Western Australia, 1986
Buku Teks