Burkhauser, R. V., & Gertler, P. J. (1995). The Health and retirement study: Data quality and early results. The University of Wisconsin Press.
Dyfyniad Arddull ChicagoBurkhauser, Richard V., and Paul J. Gertler. The Health and Retirement Study: Data Quality and Early Results. Madison, WI: The University of Wisconsin Press, 1995.
Dyfyniad MLABurkhauser, Richard V., and Paul J. Gertler. The Health and Retirement Study: Data Quality and Early Results. The University of Wisconsin Press, 1995.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.