Boyd, Robert, Ph. D. How humans evolved / Robert Boyd, Joan B. Silk. - custom ed. - New York : W.W. Norton , 2011. - 1 v. (various pagings) : ill. (some col.), col. maps ; 26 cm. Includes bibliographical references and index. ISBN: 9780393912272 (pbk.) LCCN: 96048024 Subjects--Topical Terms: Human evolution. LC Class. No.: GN281 / .B66 2011 Dewey Class. No.: 599.93/8