APA-referens (7:e uppl.)

Hopkins, W. S. (1948). Labor in the American economy. McGraw-Hill Book Co.

Chicago-referens (17:e uppl.)

Hopkins, William Stephen. Labor in the American Economy. New York: McGraw-Hill Book Co, 1948.

MLA-referens (9:e uppl.)

Hopkins, William Stephen. Labor in the American Economy. McGraw-Hill Book Co, 1948.