APA-Zitierstil (7. Ausg.)

Clotfelter, C. T., Ladd, H. F., & Vigdor, J. L. (2007). Are teacher absences worth worrying about in the US? National Bureau of Economic Research.

Chicago-Zitierstil (17. Ausg.)

Clotfelter, Charles T., Helen F. Ladd, und Jacob L. Vigdor. Are Teacher Absences Worth Worrying About in the US? Cambridge, Mass: National Bureau of Economic Research, 2007.

MLA-Zitierstil (9. Ausg.)

Clotfelter, Charles T., et al. Are Teacher Absences Worth Worrying About in the US? National Bureau of Economic Research, 2007.