Cytowanie według stylu APA (wyd. 7)

Bell, L. A., & Freeman, R. B. (2000). The incentive for working hard: Explaining hours worked differences in the U.S. and Germany. National Bureau of Economic Research.

Cytowanie według stylu Chicago (wyd. 17)

Bell, Linda A., i Richard B. Freeman. The Incentive for Working Hard: Explaining Hours Worked Differences in the U.S. and Germany. Cambridge: National Bureau of Economic Research, 2000.

Cytowanie według stylu MLA (wyd. 9)

Bell, Linda A., i Richard B. Freeman. The Incentive for Working Hard: Explaining Hours Worked Differences in the U.S. and Germany. National Bureau of Economic Research, 2000.