Cita APA (7th ed.)

Watkins, G. S. An introduction to the study of labor problems. Crowell.

Cita Chicago (17th ed.)

Watkins, Gordon S. An Introduction to the Study of Labor Problems. New York, [c1922]: Crowell.

Cita MLA (9th ed.)

Watkins, Gordon S. An Introduction to the Study of Labor Problems. Crowell.