Richardson, Elmo R., author
University of Kansas Press, 1960
Buku Teks
Rice, Charles, author
Bloomsbury Academic, 2016
Buku Teks
Flynn, John E.
Van Nostrand Reinhold, 1970
Buku Teks
edited by Don K. Price
Prentice-Hall, 1960
Buku Teks
Albright, Madeleine, author
Marimax Books, 2003
Buku Teks