Ashgate Publishing Company, 2004
Buku Teks
Hayes, Carlton J. H.
New York Macmillan, 1958 c. 1953,
Buku Teks
White, James L., author
Washington Square Press, 1966
Buku Teks
Hazen, Charles Downer
Buku Teks
Gallagher, Michael, author
McGraw-Hill, 2011
Buku Teks