@inbook{Kahn1980,
author = {Kahn, R.L. and Antonucci, T.C. },
title= {Convoys over the life course: Attachment, roles and social support},
year = {1980},
editor = {Baltes, P.B.},
editor = {Brim, O. },
booktitle = {Life-span development and behavior},
address = {New York},
publisher = {Academic Press},
pages = {253−286},
}