Corman, Calvin W., author
Little, Brown, 1983
Buku Teks
Countryman, Vern, author
Little, Brown, 1971
Buku Teks
Macintryre, Ewan, author
Blackstone Press, 1998
Buku Referensi
Corman, Calvin W., author
Little,Brown and Company, 1983
Buku Teks
Schlesinger, Rudolf B.
The Foundation Press, 1950
Buku Teks