Warda, M. (2004). How to register your own copyright (5th ed.). Sphinx Pub..
芝加哥风格引文Warda, Mark. How to Register Your Own Copyright. 5th ed. Naperville, Ill.: Sphinx Pub., 2004.
MLA引文Warda, Mark. How to Register Your Own Copyright. 5th ed. Sphinx Pub., 2004.
警告：这些引文格式不一定是100％准确.