Healy, Nicholas J.
St. Paul, Minn, 1977
Buku Teks
Lucas, jo Desha
The Foundation Press, Inc., 1978
Buku Teks
Lucas, jo Desha
The Foundation Press, 1979
Buku Teks
Maraist, Frank L.
West, A Thomson Reuters Business, 2010
Buku Teks
Keeton, Page
West Pub., 1971
Buku Teks