- U.S. Copyright Office complete web site
- Copyright Basics brochure from the U.S. Copyright Office (pdf)
- Text of the U.S. Copyright Act from the U.S. Copyright Office
- U.S. Copyright Term Lengths from Cornell University
- List of countries' copyright durations from Wikipedia
- WIPO Lex: World Intellectual Property Organization's database of treaties, judgments and foreign nations' copyright laws