APA
David P. A., Hall B. H. & Toole A. A. (1999). Is public R&D a complement or substitute for private R&D? A review of the econometric evidence. Cambridge, Mass: National Bureau of Economic Research.
Chicago
David Paul A, Hall Bronwyn H and Toole Andrew A. 1999. Is public R&D a complement or substitute for private R&D? A review of the econometric evidence. Cambridge, Mass: National Bureau of Economic Research.
Harvard
David P. A., Hall B. H. and Toole A. A. (1999). Is public R&D a complement or substitute for private R&D? A review of the econometric evidence. Cambridge, Mass: National Bureau of Economic Research.
MLA
David Paul A, Hall Bronwyn H and Toole Andrew A. Is public R&D a complement or substitute for private R&D? A review of the econometric evidence. Cambridge, Mass: National Bureau of Economic Research. 1999.