APA (7th ed.) Citation

Pakes, A., & Griliches, Z. (1980). Patents and R & D at the firm level: A first look. National Bureau of Economic Research.

Chicago Style (17th ed.) Citation

Pakes, Ariel, and Zvi Griliches. Patents and R & D at the Firm Level: A First Look. Cambridge, Mass: National Bureau of Economic Research, 1980.

MLA (9th ed.) Citation

Pakes, Ariel, and Zvi Griliches. Patents and R & D at the Firm Level: A First Look. National Bureau of Economic Research, 1980.