Copyright Law of the United States
https://www.copyright.gov/title17/

U.S. Copyright Law, December 2016 (PDF)
https://www.copyright.gov/title17/title17.pdf

Compendium of U.S. Copyright Office Practices
https://www.copyright.gov/comp3/

Frequently Asked Questions About Copyright
https://www.copyright.gov/help/faq/

Linforth, P. (25 April 2018). Wood copyright [Image]. Retrieved from https://pixabay.com/photos/wood-wooden-copyright-trademark-3350571/.