APA
Chappell N., National Bureau of Economic Research & Jaffe A. B. (2018). Intangible investment and firm performance. Cambridge: NBER.
Chicago
Chappell Nathan, National Bureau of Economic Research and Jaffe Adam B. 2018. Intangible investment and firm performance. Cambridge: NBER.
Harvard
Chappell N., National Bureau of Economic Research and Jaffe A. B. (2018). Intangible investment and firm performance. Cambridge: NBER.
MLA
Chappell Nathan, National Bureau of Economic Research and Jaffe Adam B. Intangible investment and firm performance. Cambridge: NBER. 2018.