@book{Angrist2008,
author = {Angrist, Joshua D. and Pischke, Jörn-Steffen},
title= {Mostly harmless econometrics: An empiricist’s companion},
year = {2008},
doi = {10.2307/j.ctvcm4j72},
URL = {https://doi.org/10.2307/j.ctvcm4j72},
publisher = {New Jersey: Princeton University Press},
}