Cita APA (7th ed.)
Warda, M. (2004). How to register your own copyright (5th ed.). Sphinx Pub..
Cita Chicago (17th ed.)
Warda, Mark. How to Register Your Own Copyright. 5th ed. Naperville, Ill.: Sphinx Pub., 2004.
Cita MLA (9th ed.)
Warda, Mark. How to Register Your Own Copyright. 5th ed. Sphinx Pub., 2004.
Atenció: Aquestes cites poden no estar 100% correctes.