APA
Williams H. L., National Bureau Of Economic Research, . (2010). Intellectual Property Rights and Innovation: Evidence from t. Cambridge: NBER.
Chicago
Williams Heidi L, National Bureau Of Economic Research, . 2010. Intellectual Property Rights and Innovation: Evidence from t. Cambridge: NBER.
Harvard
Williams H. L., National Bureau Of Economic Research, . (2010). Intellectual Property Rights and Innovation: Evidence from t. Cambridge: NBER.
MLA
Williams Heidi L, National Bureau Of Economic Research, . Intellectual Property Rights and Innovation: Evidence from t. Cambridge: NBER. 2010.