Gregg, Davis Weiner
University of Pennsylvania by R.D. Irwin, 1962
Buku Teks
Waddams, S.M., editor
Canada Law Book INC, 1984
Buku Teks
Calamari, John D.
West Publishing, 1987
Buku Teks
Greeg, Davis W.
Richard D. Irwin, Inc., 1960
Buku Teks
Eisenberg, Melvin A.
Harcourt Brace, 1994
Buku Teks