1. Volterra Integral and Differential Equations;Burton,1983
2. Integral Equations and Applications;Corduneanu,1991
3. Nonlinear Volterra Integral Equations;Miller,1971
4. Differential-Difference Equations;Bellman,1963
5. Introduction to the Theory and Application of Differential Equations with Deviating Arguments;El’sgol’ts,1973