Lichtenberg, F., & Potterie, B. v. P. d. l. (1996). International R & D spillovers: A re-examination. National Bureau of Economic Research.
Lua i Stíl Chicago (17ú heag.)Lichtenberg, Frank, agus Bruno van Pottelsberghe de la Potterie. International R & D Spillovers: A Re-examination. Cambridge: National Bureau of Economic Research, 1996.
Lua MLA (9ú heag.)Lichtenberg, Frank, agus Bruno van Pottelsberghe de la Potterie. International R & D Spillovers: A Re-examination. National Bureau of Economic Research, 1996.
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