Ackermann, Robert John Philosophy of science an introduction [by] Robert Ackermann. - New York Pegasus [1970] - 166 p. 22 cm. - Pegasus traditions in philosophy . 920504 Bibliography: p. 159-164. LCCN: 79110438 Subjects--Topical Terms: Science--Philosophy. LC Class. No.: Q175 / .A27 Dewey Class. No.: 501