Curtin, Daniel J.
Solano Press Books, 1993
Buku Teks
Patterson Smith, 1976
Buku Teks
Chapin, F. Stuart (Francis Stuart), 1916-, author
University of Illinois Press, 1979
Buku Teks
Robert, Neal Alison
Macmillan, 1972
Buku Teks
Kaiser, Edward John, author
University of Illinois Press, 1995
Buku Teks