Calamari, John D.
The law of contracts
West Publishing, 1987
 Buku Teks
Bernacchi, Richard L.
Data processing contracts and the law
Brown and Company, 1974
 Buku Teks
Eisenberg, Melvin A.
Contracts Gilbert law summaries
Harcourt Brace, 1994
 Buku Teks
Hunter, Howard O.
Modern Law of Contracts
Gorham & Lamont, 1987
 Buku Teks
Simpson, Laurence P.
Handbook of the law of contracts
West Publishing, 1954
 Buku Teks