Cooley, Thomas M.
Little, Brown and Company, 1898
Buku Teks
Munro, William Bennett, author
Macmillan, 1952
Buku Teks
Nowak, John E., author
Thomson/West, 2010
Buku Teks
introduction by Edward G. Smith
Barnes & Noble, 1966
Buku Teks
Dumbauld, Edward, author
University of Oklahoma Press, 1946
Buku Teks