Jones, Harry W., author
The Foundation Press, 1980
Buku Teks
Berch, Michael A., author
West, 2010
Buku Teks
Sykes, Alan O.
St.Paul,Minn., 1995
Buku Teks
Maher, F.K.H. (Francis Kevin Heathcote), author
Law Book Company, 1971
Buku Teks
edited by Rudolf Schlesinger
Foundation Press, 1959
Buku Teks