Richard Crawford Pugh
St.paul Minn, 1993
Buku Teks
John E. Noyes
St.paul Minn, 1997
Buku Teks
Jaffe, Louis L., author
Little, Brown, 1968
Buku Teks
Corman, Calvin W., author
Little,Brown and Company, 1983
Buku Teks
Barrett, Edward L., author
Foundation Press, 1977
Buku Teks