@article{Hoffman1978,
author = {Hoffman, L.W. and Thornton, A. and Manis, J.D.},
title= {The value of children to parents in the United States},
year = {1978},
doi = {10.1007/BF01277597},
journal = {Journal of Population},
volume = {1},
number = {2},
pages = {91‒131},
}