Handler, Milton
Foundation Press,, 1972
Buku Teks
Oppenheim, S. Chesterfield
Little, Brown , 1971
Buku Teks
Little,Brown and Company, 1975
Buku Teks
Farnsworth, E. Allan
University casebook series, 1995
Buku Teks
Schecter, Roger E.
West Pub. Co, 1993
Buku Teks