@book{TL-170-NIDA,
author="Cefalu, Matthew and Shuangshuang Liu and Craig Martin",
title="Toolkit for Weighting and Analysis of Nonequivalent Groups: A Tutorial on the TWANG Commands for Stata",
address="Santa Monica, CA",
year="2015",
doi="10.7249/TL170",
publisher="RAND Corporation"
}%n