Ackermann, Robert John The philosophy of Karl Popper / Robert John Ackermann - Amherst : University of Massachusetts Press , 1976 - x, 212p. ; 25 cm. Includes indexes. Bibliography: p. 193-203. ISBN: 0870231987 Subjects--Personal Names: Popper, Karl R 1902-1994 Dewey Class. No.: 100 / ACK