@inbook{Ryder1992,
author = {Ryder, N.B.},
title= {The centrality of time in the study of the family},
year = {1992},
editor = {Berquo, E.},
editor = {Xenos, P.},
booktitle = {Family Systems and Cultural Change},
address = {Oxford},
publisher = {Clarendon},
pages = {161--75},
}