Zucker, L. G., Darby, M. R., & Peng, Y. (1998). Fundamentals or population dynamics and the geographic distribution of U.S. biotechnology enterprises, 1976-1989. National Bureau of Economic Research.
Chicago-viite (17. p.)Zucker, Lynne G., Michael R. Darby, ja Yusheng Peng. Fundamentals or Population Dynamics and the Geographic Distribution of U.S. Biotechnology Enterprises, 1976-1989. Cambride: National Bureau of Economic Research, 1998.
MLA-viite (9. p.)Zucker, Lynne G., et al. Fundamentals or Population Dynamics and the Geographic Distribution of U.S. Biotechnology Enterprises, 1976-1989. National Bureau of Economic Research, 1998.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.