Honsberger, Ross, 1929- Ingenuity in mathematics / Ross Honsberger - New York : Random House/Singer School Division , [c1970] - vii, 204 p. : ill. ; 24 cm. - New mathematical library, 23 . Includes bibliographical references ( p. 203-204.) Subjects--Topical Terms: Mathematics. Dewey Class. No.: 510