Konvitz, Milton Ridvas, 1908-2003, author
Ithaca, 1963
Buku Teks
Gunther, Gerald, author
Foundation Press, 1979
Buku Teks
Forsythe, David P., 1941-, author
Angkasa, 1993
Buku Teks
Douglas, William O., author
Doubleday, 1961
Buku Teks
Forsythe, David P., 1941-, author
University of Nebraska Press, 1983
Buku Teks