Sykes, Alan O.
St.Paul,Minn., 1995
Buku Teks
Jackson, John H., author
West Publishing, 2013
Buku Teks
Fulmer, William E., author
Richard D. Irwin, 1980
Buku Teks
Jones, Harry W., author
The Foundation Press, 1980
Buku Teks
Steiner, Henry J., author
The Foundation Press, 1968
Buku Teks