@misc{Kost2015,
author = {Kost, K. },
title= {Unintended Pregnancy Rates at the State Level: Estimates for 2010 and Trends Since 2002},
year = {2015},
URL = {http://www.guttmacher.org/pubs/StateUP10.pdf.},
publisher = {Guttmacher Institute},
address = {New York},
}