Jones, Harry W., author
The Foundation Press, 1980
Buku Teks
Berch, Michael A., author
West, 2010
Buku Teks
William J.Devey
St.Paul,Minn., 1995
Buku Teks
Jackson, John H., author
St.Paul,Minn., 1995
Buku Teks
Sykes, Alan O.
St.Paul,Minn., 1995
Buku Teks