Dobler, Donald W., author
McGraw-Hill, 1984
Buku Teks
St,Paul,Minn, 1994
Buku Teks
Glendon, Mary Ann
St. Paul, Minn West Publishing 1991,
Buku Teks
Jackson, John H., author
West Publishing, 2013
Buku Teks
Steiner, Henry J., author
The Foundation Press, 1968
Buku Teks