APA (7th ed.) Citation

Coe, D. T., & Helpman, E. (1993). International R&D spillovers. National Bureau of Economic Research.

Chicago Style (17th ed.) Citation

Coe, David T., and Elhanan Helpman. International R&D Spillovers. Cambridge, Mass: National Bureau of Economic Research, 1993.

MLA (9th ed.) Citation

Coe, David T., and Elhanan Helpman. International R&D Spillovers. National Bureau of Economic Research, 1993.