Ackermann, Robert John, 1933- Modern deductive logic: an introduction to its techniques and significance/ Robert John Ackermann. - London: Macmillan, 1970 - viii, 261 p. 19 cm. - Modern introductions to philosophy . Bibliography: p. 231-234. ISBN: 0333080807 0333111389 (pbk) Subjects--Topical Terms: Logic. Dewey Class. No.: 162 / ACM 1970