Hopkins, W. S. (1948). Labor in the American economy. New York: McGraw-Hill Book Company, Inc.
Trích dẫn kiểu ChicagoHopkins, William Stehen. Labor in the American Economy. New York: McGraw-Hill Book Company, Inc, 1948.
MLA citiranjeHopkins, William Stehen. Labor in the American Economy. New York: McGraw-Hill Book Company, Inc, 1948.
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