The Law of excluded middle or the Principle of the excluded middle is a fundamental basis and rule of logic. It states that there is no middle ground between being and nonbeing.
- D.Q. Mcinerny (2004). Being Logical: A Guide to Good Thinking. The Random House Publishing Group.
- Deborah J. Bennett (2004). Logic Made Easy: How to Know When Language Deceives You. W.W. Norton & Company