Wilson, J. F.
Principles of the law of contract
Sweet & Maxwell, 1957
 Buku Teks
Alsagoff, Syed Ahmad
Principles of the Law of Contract in Malaysia
LexisNexis, 2010
 Buku Teks
Smith, James Cruickshanks, 1867-1946
Fundamental Principles of Law The Law of Contract
Sweet & Maxwell, 1989
 Buku Teks
Anson, William R., Sir
Principles of the law of contract : with a chapter on the law of agency
Oxford University Press, 1930
 Buku Teks
Burton, Steven J.
Principles of contract law/ Steven J. Burton
West Publishing Co., 1995
 Buku Teks