Schultz, T. W. (1993). Origins of increasing returns. Blackwell.
Cita Chicago Style (17a ed.)Schultz, Theodore W. Origins of Increasing Returns. Cambridge: Blackwell, 1993.
Cita MLA (8a ed.)Schultz, Theodore W. Origins of Increasing Returns. Blackwell, 1993.
Precaución: Estas citas no son 100% exactas.