Schechter, Roger E., author
Thomson West, 2003
Buku Teks
Stim, Richard, author
West Thomson Learning, 2001
Buku Referensi
Kintner, Earl W., author
Macmillan, 1975
Buku Teks
Harris, Thorne D., author
Prentice-Hall, 1984
Buku Teks
Edenborough, Michael, author
Cavendish Publishing , 1994
Buku Teks