Sheppard, P. M. Natural selection and heredity / by P. M. Sheppard - 3rd ed. - London : Hutcinson University Library, 1967. - 192 p. : ill., 2 maps, tables, diagr. ; 22 cm. - Biological sciences series . Bibliography : p. 184-186. ISBN: 0090368045 Subjects--Topical Terms: Natural selection.Genetics.