APA (7th ed.) Citation

Hopenhayn, H. A., & Mitchell, M. F. (1999). Innovation fertility and patent design. National Bureau of Economic Research.

Chicago Style (17th ed.) Citation

Hopenhayn, Hugo A., and Matthew F. Mitchell. Innovation Fertility and Patent Design. Cambridge: National Bureau of Economic Research, 1999.

MLA (9th ed.) Citation

Hopenhayn, Hugo A., and Matthew F. Mitchell. Innovation Fertility and Patent Design. National Bureau of Economic Research, 1999.