Freeman, Richard B. 1943- Labor economics [by] Richard B. Freeman. - Englewood Cliffs, N.J., Prentice-Hall [1972] - viii, 136 p. illus. 25 cm. ISBN: 013517466X 0135174589 (pbk.) LCCN: 73181299 LC Class. No.: HB301 .F674 1972 / .F674 Dewey Class. No.: 331