Ahmadpour, ayyub (2005), economic hardship in performance of contracts: A comparative study of English American and german law and CISG, Aberdeen University.
Barak, Aharon (2006), Constitutional Human Rights and Private Law, hart publishing. Oxford and Portland, Oregon.
Black, henry (1968), law dictionary, London, west publication.
Coleman, jules, Shapiro Scott (2002), the oxford handbook of jurisprudence and philosophy of law, oxford university press.
Dawson, jhon (1983), judicial revision of frustrated contracts in Germany, Boston university press.
Pad field, Colin (2001), law made simple, Tehran, majd publication.