Reiss, Michael, author
University Press, 2000
Buku Teks
edited by J.N.R. Jeffers
Parthenon, 1992
Buku Teks
Camougis, George, author
McGraw-Hill, 1981
Buku Teks
Boughey, Arthur S., author
Dickenson , 1967
Buku Teks
Grant, W.D., author
Blackie, 1981
Buku Teks