Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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