- Conscience: An Interdisciplinary View: Salzburg Colloquium on Ethics in the Sciences and Humanities
- Gods Existence. Can It Be Proven?: A Logical Commentary on the Five Ways of Thomas Aquinas
- Foundations of Logic and Linguistics: Problems and Their Solutions
- Logische Schriften: Grosses Logikfragment ― Grundgesetze des Sollens
- Laws of Nature