APA
Kellogg Maxwell et al, National Bureau of Economic Research, . (2020). Combining matching and synthetic controls to trade off biases from extrapolation and interpolation. Cambridge: NBER.
Chicago
Kellogg Maxwell et al, National Bureau of Economic Research, . 2020. Combining matching and synthetic controls to trade off biases from extrapolation and interpolation. Cambridge: NBER.
Harvard
Kellogg Maxwell et al, National Bureau of Economic Research, . (2020). Combining matching and synthetic controls to trade off biases from extrapolation and interpolation. Cambridge: NBER.
MLA
Kellogg Maxwell et al, National Bureau of Economic Research, . Combining matching and synthetic controls to trade off biases from extrapolation and interpolation. Cambridge: NBER. 2020.