Lewis, J. Parry 1927- An introduction to mathematics for students of economics / J. Parry Lewis. - 2nd ed. - London : St. Martin's Press, 1969. - xiii, 590 p. : illus. ; 23 cm. Includes bibliography. Open access. ISBN: 0333073029 LCCN: 7776382 Subjects--Topical Terms: Mathematics--1961-