1. Linear Operators I;Dunford,1963
2. Nonlinear Functional Analysis;Deimling,1985
3. Integral Equations and Applications;Corduneanu,1991
4. Existence Theory for Nonlinear Integral and Integrodifferential Equations;O'Regan,1998
5. Positive Solutions of Differential, Difference and Integral Equations;Agarwal,1999