Calamari, John D.
Contracts
West Publishing, 1987
 Buku Teks
Calamari, John D.
Contracts
West Publishing, 1990
 Buku Teks
Farnsworth, E. Allan
Contracts
Little, Brown, 1990
 Buku Teks
Schaber, Gordon D.
Contracts in a nutshell
West Publishing, 1990
 Buku Teks
Waddams, S.M., editor
The Law of Contracts
Canada Law Book INC, 1984
 Buku Teks