1. The Numerical Solution of Volterra Equations;Brunner,1986
2. Integral Equations and Stability of Feedback Systems;Corduneanu,1973
3. An Introduction to Difference Equations;Elaudy,1996
4. Introduction to Functional Differential Equations;Hale,1993
5. Introduction to the Theory and Applications of Functional Differential Equations;Kolmanovskii,1999