Isaac, Glynn Llywelyn, 1937-1985. Human ancestors : readings from Scientific American / [compiled by and] with an introd. by Glynn Isaac, Richard E. F. Leakey. - San Francisco : W. H. Freeman, c1979. - vi, 130 p. : ill. ; 29 cm. Includes index. Bibliography: p. [125]-126. Subjects--Topical Terms: Human evolution. Paleolithic period. Dewey Class. No.: 573.2