Cita APA (7th ed.)

Levinsohn, J., & Petrin, A. (2000). Estimating production functions using inputs to control for unobservables. National Bureau of Economic Research.

Cita Chicago (17th ed.)

Levinsohn, James, i Amil Petrin. Estimating Production Functions Using Inputs to Control for Unobservables. Cambridge: National Bureau of Economic Research, 2000.

Cita MLA (9th ed.)

Levinsohn, James, i Amil Petrin. Estimating Production Functions Using Inputs to Control for Unobservables. National Bureau of Economic Research, 2000.