@misc{Herr2012,
author = {Herr, J.L.},
title= {Measuring the effect of the timing of first birth [unpublished manuscript]},
year = {2012},
URL = {http://emlab.berkeley.edu/users/webfac/moretti/e251_f12/herr.pdf},
publisher = {University of California, Berkeley},
address = {Berkeley},
}