APA
Freeman R. B., National Bureau of Economic Research, Huang W. & Li. (2019). Non-linear incentives and worker productivity and earnings. Cambridge: NBER.
Chicago
Freeman Richard B, National Bureau of Economic Research, Huang Wei and Li. 2019. Non-linear incentives and worker productivity and earnings. Cambridge: NBER.
Harvard
Freeman R. B., National Bureau of Economic Research, Huang W. and Li. (2019). Non-linear incentives and worker productivity and earnings. Cambridge: NBER.
MLA
Freeman Richard B, National Bureau of Economic Research, Huang Wei and Li. Non-linear incentives and worker productivity and earnings. Cambridge: NBER. 2019.