1. “Copyright Timeline: A History of Copyright in the United States.” Association of Research Libraries. https://www.arl.org/copyright-timeline
2. “Trans-Pacific Partnership Agreement.” Electronic Frontier Foundation. https://www.eff.org/issues/tpp
3. “U.S. Patent Activity.” United States Patent and Trademark Office. https://www.uspto.gov/web/offices/ac/ido/oeip/taf/h_counts.htm
4. Ali, A. (2020, Nov. 12). The Soaring Value of Intangible Assets in the S&P 500. Visual Capitalist. https://www.visualcapitalist.com/the-soaring-value-of-intangible-assets-in-the-sp-500
5. Unpatented Innovation and Merger Synergies