1. The Threat to Academic Freedom … from Academics
https://medium.com/@leej12255/the-threat-to-academic-freedom-from-academics-4685b1705794
2. Conservatives Are the Real Campus thought Police Squashing Academic Freedom
https://www.washingtonpost.com/news/posteverything/wp/2017/10/10/conservatives-are-the-real-campus-thought-police-squashing-academic-freedom/
3. A History of Freedom of Thought;Bury,2004
4. Brooklyn Institute of Arts v. City of New York, 64 F. Supp. 2d 184 (E.D.N.Y. 1999)
https://law.justia.com/cases/federal/district-courts/FSupp2/64/184/2578531/
5. Spence v. Washington, 418 U.S. 405
https://supreme.justia.com/cases/federal/us/418/405/#tab-opinion-1950911