APA
Freyaldenhoven S., National Bureau of Economic Research, Hansen C. & Shapiro J. M. (2018). Pre-event trends in the panel event-study design. Cambridge: NBER.
Chicago
Freyaldenhoven Simon, National Bureau of Economic Research, Hansen Christian and Shapiro Jesse M. 2018. Pre-event trends in the panel event-study design. Cambridge: NBER.
Harvard
Freyaldenhoven S., National Bureau of Economic Research, Hansen C. and Shapiro J. M. (2018). Pre-event trends in the panel event-study design. Cambridge: NBER.
MLA
Freyaldenhoven Simon, National Bureau of Economic Research, Hansen Christian and Shapiro Jesse M. Pre-event trends in the panel event-study design. Cambridge: NBER. 2018.