Zill, Dennis G. A first course in differential equations with modeling applications / Dennis G. Zill. - 9th ed. - Belmont, CA : Brooks/Cole, Cengage Learning, c2009. - xiii, 362, 23, 16, 7 p. : ill. ; 27+ cm. Includes index. ISBN: 9780495556220 Subjects--Topical Terms: Differential equations --Textbooks. LC Class. No.: QA372 / .Z55 2009