Dyfyniad APA

Porter, M. E., & Stern, S. (2000). Measuring the "ideas" production function: Evidence from international patent output. National Bureau of Economic Research.

Dyfyniad Arddull Chicago

Porter, Michael E., and Scott Stern. Measuring the "Ideas" Production Function: Evidence from International Patent Output. Cambridge: National Bureau of Economic Research, 2000.

Dyfyniad MLA

Porter, Michael E., and Scott Stern. Measuring the "Ideas" Production Function: Evidence from International Patent Output. National Bureau of Economic Research, 2000.

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