@inbook{David1992,
author = {David, P. and Sanderson, W. },
title= {Rudimentary contraceptive methods and the American transition to marital fertility control, 1855-1915},
year = {1992},
editor = {Engerman, S.L.},
editor = {Gallman, R.E.},
booktitle = {Long Term Factors in American Economic Growth},
address = {Chicago},
publisher = {University of Chicago Press},
pages = {307--379},
}