-Book
49. Charman, M.(2007) Contract Law, 4th Ed, Milton: Willan Publishing.
50. Monahan, G. (2001) Essential Contract Law, 2nd Ed Cavendish Publishing Limited.
51. Stone, R.(2009) the Modern Law of Contract, 8th Ed, Taylor & Francis.
-Paper
52. Angelo, A.H, Ellinger, E.P.(1992)“Unconscionable Contracts: A Comparative Study of the Approaches in England, France, Germany, and the United States”, the Loyola of Los Angeles International and Comparative Law Review, 14:455-506.