The Commision, 1980
Buku Teks
Prentice-Hall, 1960
Buku Teks
Christenson, Reo M.
Harper & Row Publishers, 1982
Buku Teks
Brewster, Lawrence G., author
St. Martin`s Press, 1982
Buku Teks
edited by Philip John Davies and Fredric A. Waldstein
Manchester University Press, 1987
Buku Teks