Dyfyniad APA

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.

Dyfyniad Arddull Chicago

Cohen, Wesley M., Richard R. Nelson, and 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.

Dyfyniad MLA

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.

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