Ennis, Robert Hugh, 1927- Ennis, Robert Hugh, 1927- Logic in teaching [by] Robert H. Ennis. - Englewood Cliffs, N.J., Prentice-Hall [1969] Includes bibliographical references. ISBN: 0135400961 8.50 LCCN: 69017479 Subjects--Topical Terms: Logic in teaching. LC Class. No.: BC161.T4 / E5 Dewey Class. No.: 371.3