Gordis, Leon, Epidemiology. - 4th ed. - Philadelphia : Elsevier/Saunders, 2009. - xv, 375 p. ill. 26 cm. Includes bibliographical references and index. ISBN: 9781416040026 Subjects--Topical Terms: Epidemiology.Epidemiology.Epidemiologic Methods. National Library of Medicine Call No.: WA 105 GE 2009