Cita APA (7th ed.)

Freeman, R. B. (1979). Labor economics (2nd ed.). Prentice Hall.

Cita Chicago (17th ed.)

Freeman, Richard B. Labor Economics. 2nd ed. Englewood Cliffs, N. J: Prentice Hall, 1979.

Cita MLA (9th ed.)

Freeman, Richard B. Labor Economics. 2nd ed. Prentice Hall, 1979.