1. Committee for Economic Development of The Conference Board. (n.d.). https://www.ced.org
2. Congressional Research Service. (2020). US Research and Development Funding and Performance Fact Sheet. https://sgp.fas.org/crs/misc/R44307.pdf
3. Elson, A. (2019). The United States in the World Economy. Springer.
4. Executive Office of the President. (2021). The Economic Report of the President. https://www.govinfo.gov/content/pkg/ERP-2021/pdf/ERP-2021.pdf
5. Levy, J. (2021). Ages of American Capitalism: A History of the United States. Random House.