1. Difference Equations and Inequalities. Theory, Methods and Applications;Agarwal,1992
2. An Introduction to Difference Equations;Elaydi,1996
3. Periodicity in Nonlinear Difference Equations;Grove,2005
4. Difference Equations;Kelly,1991
5. Global Behaviour of Nonlinear Difference Equations of Higher Order with Applications;Kocic,1993