Freeman, R. B. (1972). Labor economics. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Freeman, Richard B. Labor Economics. Englewood Cliffs, N.J.: Prentice-Hall, 1972.
Lua MLA (9ú heag.)Freeman, Richard B. Labor Economics. Prentice-Hall, 1972.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.