Cawley, J. H., Grabowski, D. C., & Hirth, R. A. (2004). Factor substitution and unobserved factor quality in nursing homes. National Bureau of Economic Research.
Chicago-Zitierstil (17. Ausg.)Cawley, John H., David C. Grabowski, und Richard A. Hirth. Factor Substitution and Unobserved Factor Quality in Nursing Homes. Cambridge, Mass: National Bureau of Economic Research, 2004.
MLA-Zitierstil (9. Ausg.)Cawley, John H., et al. Factor Substitution and Unobserved Factor Quality in Nursing Homes. National Bureau of Economic Research, 2004.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.