Cohen, W. M., Nelson, R. R., & Walsh, J. P. (2000). Protecting their intellectual assets: Appropriability conditions and why U.S. manufacturing firms patent(or not). National Bureau of Economic Research.
Chicago-referens (17:e uppl.)Cohen, Wesley M., Richard R. Nelson, och John P. Walsh. Protecting Their Intellectual Assets: Appropriability Conditions and Why U.S. Manufacturing Firms Patent(or Not). Cambridge: National Bureau of Economic Research, 2000.
MLA-referens (9:e uppl.)Cohen, Wesley M., et al. Protecting Their Intellectual Assets: Appropriability Conditions and Why U.S. Manufacturing Firms Patent(or Not). National Bureau of Economic Research, 2000.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.