Wetter, J. J. (2011). The impacts of research and development expenditures: The relationship between total factor productivity and U.S. gross domestic product performance. Springer.
Lua i Stíl Chicago (17ú heag.)Wetter, John J. The Impacts of Research and Development Expenditures: The Relationship Between Total Factor Productivity and U.S. Gross Domestic Product Performance. New York, NY: Springer, 2011.
Lua MLA (9ú heag.)Wetter, John J. The Impacts of Research and Development Expenditures: The Relationship Between Total Factor Productivity and U.S. Gross Domestic Product Performance. Springer, 2011.
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