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
Murray, John Edward
Murray on contracts
Michie, 1990
 Buku Teks