Lewis, Keith, author
Crest, 2001
Buku Teks
Stephen Young [and others]
Prentice-Hall, [date of publication not identified]
Buku Teks
Monk, Keith, author
McGraw-Hill, 1989
Buku Teks
James, Harvey S. (Harvey Stanley), author
Praeger, 1993
Buku Teks
Toyne, Brian
Allyn and Bacon, 1989
Buku Teks