@book{Zhao2020,
author = {Zhao, Y. and Strauss, J. and Chen, X. and Wang, Y. and Gong, J. and Meng, Q. and Wang, G. and Wang, H.},
title= {China Health And Retirement Longitudinal Study wave 4 user’s guide},
year = {2020},
address = {Beijing},
publisher = {National School of Development, Peking University},
}