Dawson, John Philip, author
Foundation Press, 1969
Buku Teks
Cook,Franklin H.
Macmillan, 1951
Buku Teks
Prosser, William L., author
West Publishing, 1971
Buku Teks
Keeton, Page, author
West Pub., 1971
Buku Teks
Franklin, Marc A., author
The Foundation Press, 1979
Buku Teks