Sources

Texas v.Johnson. About.com. 2/19/09 <https://atheism.about.com/od/flagburningcourtcases/a/TexasJohnson.htm>.

Texas v Johnson . 2/19/09 <https://www.openc.k12.or.us/citeintro/citeintro.php?sessionid=68321b399fd70a0c9d45ca2373715bfa&Grd=Sec&sourcetype=Professional&lastname=&firstname=&title=Texas+v.+Johnson&date=&othertitle=About.com&otherdate=2%2F19%2F09&url=http%3A%2F%2Fatheism.about.com%2Fod%2Fflagburningcourtcases%2Fa%2FTexasJohnson.htm&insert=Save+Citation>.

Webster, Merriam. Penal. Merriam Webster. 2/12/09 <https://mw1.merriam-webster.com/dictionary/penal>. 

The Oyez Project, Texas v. Johnson, 491 U.S. 397 (1989),
available at: <https://www.oyez.org/cases/1980-1989/1988/1988_88_155/>
(last visited Thursday, February 19, 2009).

Apel, Warren. The Flag Burning Page. The Flag Protection Act of 1989.  2/11/09 <https://www.esquilax.com/flag/protection.shtml>.