@inbook{Harper2005,
author = {Harper, S.},
title= {Grandparenthood},
year = {2005},
doi = {10.1017/CBO9780511610714.044},
editor = {Johnson, M.L.},
booktitle = {The Cambridge handbook of age and ageing},
address = {Cambridge},
publisher = {Cambridge University Press},
pages = {422--428},
}