@book{Heeringa1995,
author = {Heeringa, S.G. and Connor, J.H.},
title= {Technical description of the Health and Retirement Survey sample design},
year = {1995},
doi = {10.7826/ISR-UM.06.585031.001.05.0001.1995},
address = {Ann Arbor, MI},
publisher = {University of Michigan},
}