Elementary Differential Equations. - Martin, William TedReissner Eric (Massachusetts : Addison-Wesley Publishing Company, Inc., 1956)
CAP.1:Natural and Origin of Differential EquationsCAP.2:The Differential Equation of First OrderCAP.3:Second Order Differential Equations.CAP.4:Higher Order Differential Equations.CAP.5:Systems of First Order Differential Equations.CAP.6:Approximate Solution of First Order Differential Equations and Picard's Theorem.CAP.7:Finite Difference Equations.CAP.8:Partial Differential Equations.