Elements of Ordinary Differential Equations - Pennisi,Louis L. (New York : Holt,Rinehart, 1972)
Chap[ter 1:Formation of differential equations and their solutionsChapter 2:Equations of the first orderChapter 3:Applications of first-order differential equationsChapter 4:Second-order linear differential equationsChapter 5:Applications of second-order linear differential equationsChapter 6:Higher-order linear differential equationsChapter 7:Series solutions of linear differential equationsChapter 8:Systems of linear differential equations.