@article{Burch1970,
author = {Burch, T.K. and Gendell, M. },
title= {Extended Family Structure and Fertility: Some Conceptual and Methodological Issues},
year = {1970},
doi = {10.2307/350128},
journal = {Journal of Marriage and Family},
volume = {32},
number = {2},
pages = {227--236},
}