@article{Luo2012,
author = {Luo, Y. and LaPierre, T.A. and Hughes, M.E. and Waite, L.J.},
title= {Grandparents providing care to grandchildren: A population-based study of continuity and change},
year = {2012},
doi = {10.1177/0192513X12438685},
journal = {Journal of Family Issues},
volume = {33},
number = {9},
pages = {1143--1167},
}