APA
Abrams D. S., National Bureau of Economic Research, Akcigit U. & Popadak J. (2013). Patent value and citations. Cambridge: NBER.
Chicago
Abrams David S, National Bureau of Economic Research, Akcigit Ufuk and Popadak Jillian. 2013. Patent value and citations. Cambridge: NBER.
Harvard
Abrams D. S., National Bureau of Economic Research, Akcigit U. and Popadak J. (2013). Patent value and citations. Cambridge: NBER.
MLA
Abrams David S, National Bureau of Economic Research, Akcigit Ufuk and Popadak Jillian. Patent value and citations. Cambridge: NBER. 2013.