APA
Hao B., National Bureau of Economic Research & Galiani S. (2019). Assessing external validity /'. Cambridge: NBER.
Chicago
Hao Bo, National Bureau of Economic Research and Galiani Sebastian. 2019. Assessing external validity /'. Cambridge: NBER.
Harvard
Hao B., National Bureau of Economic Research and Galiani S. (2019). Assessing external validity /'. Cambridge: NBER.
MLA
Hao Bo, National Bureau of Economic Research and Galiani Sebastian. Assessing external validity /'. Cambridge: NBER. 2019.