Olafson, Frederick A. Ethics and twentieth century thought [by] Frederick A. Olafson. - Englewood Cliffs, N.J., Prentice-Hall [1973] - ix, 134 p. 23 cm. - Context of thought . Bibliography: p. 128-129. ISBN: 0132905280 0132905108 (pbk) Source: $3.95 (pbk) LCCN: 72008962 Subjects--Topical Terms: Ethics.Social sciences and ethics. LC Class. No.: BJ37 / .O34 Dewey Class. No.: 170