Polking J., Boggess A., Arnold D. Differential Equations with Boundary Value Problems

Second Edition. — Pearson Prentice Hall, 2006. — 768 p. — ISBN: 0-13-186236-7.Combining traditional differential equation material with a modern qualitative and systems approach, this new edition continues to deliver flexibility of use and extensive problem sets. The second edition’s refreshed presentation includes extensive new visuals, as well as updated exercises throughout.