Segal, Nancy L., 1951- Entwined lives : twins and what they tell us about human behavior / Nancy L. Segal. - New York : Dutton, c1999. - xx, 396 p. : ill. ; 25 cm. - 155.44/4 . Includes bibliographical references (p. [338]-386) and index. ISBN: 0525944656 (alk. paper) Subjects--Topical Terms: Twins--Psychology.Nature and nurture. Dewey Class. No.: 155.44/4