Wilson, J. F., author
Principles of the law of contract
Sweet & Maxwell, 1957
 Buku Teks
Anson, Sir William R
Principles of the English law of contract and of agency in its relation to contract
3124, 1961
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Elliot, Catherine, author
Contract law
Longman , 2001
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Anson, Sir William R.
Principles of the english law of contract and of agency in its relation to contract/ Sir William R. Anson
At The Clarendon Press, 1947
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Brown, Ian, author
Law of contract
Blackstone, 1994
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