APA-Zitierstil (7. Ausg.)

Freeman, R. B. (1996). Working for nothing: The supply of volunteer labor.

Chicago-Zitierstil (17. Ausg.)

Freeman, Richard B. Working for Nothing: The Supply of Volunteer Labor. Cambridge, Mass, 1996.

MLA-Zitierstil (9. Ausg.)

Freeman, Richard B. Working for Nothing: The Supply of Volunteer Labor. 1996.