APA
Howard D. H., National Bureau of Economic Research & Shen Y. C. (2011). Comparative effectiveness research, courage, and technological abandonment. Cambridge: NBER.
Chicago
Howard David H, National Bureau of Economic Research and Shen Yu Chu. 2011. Comparative effectiveness research, courage, and technological abandonment. Cambridge: NBER.
Harvard
Howard D. H., National Bureau of Economic Research and Shen Y. C. (2011). Comparative effectiveness research, courage, and technological abandonment. Cambridge: NBER.
MLA
Howard David H, National Bureau of Economic Research and Shen Yu Chu. Comparative effectiveness research, courage, and technological abandonment. Cambridge: NBER. 2011.