Bolton, P. and M. Dewatripoint: Contract Theory, 2005. MIT Press. ISBN: ISBN-10: 0-262-02576-0 ISBN-13: 978-0-262-02576-8. . Chapters 1-4 and 11.
Mas-Colell, A., Whinston, M.D., and Green, J.R. (1995). Microeconomic Theory, Oxford University Press.
Osborne, M and Rubinstein, A: A Course in Game Theory, 1994. MIT Press, Cambridge. 1, 2, 3.1, 4, 6.1-3, 7.1-2, 8.1-3 (till top p. 138), 8.8-9, 11.1, 11.4-5, 12.1-2, 12.4-5 (this book can be downloaded from the net).