@inbook{Hoffman1973,
author = {Hoffman, L.W. and Hoffman, M.L.},
title= {The value of children to parents},
year = {1973},
editor = {Fawcett, J.T.},
booktitle = {Psychological perspectives on population},
address = {New York},
publisher = {Basis Books},
pages = {19--76},
}