Stanway, Andrew, author
Sheldon Press, 1990, 1990
Buku Referensi
Goth, Peter, author
A Ward Lock Book, 1994
Buku Referensi
Dorling Kondsley, 1993
Buku Referensi
McGraw-Hill, Higher Education, 2005
Buku Teks
DeWitt, Anthony L., author
Jones & Bartlett Learning, 2010
Buku Teks