@inbook{David1986,
author = {David, P.A., and Sanderson, W.C. },
title= {Rudimentary contraceptive methods and the American transition to marital fertility control, 1855–1915},
year = {1986},
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--390},
}