1. A New Approach to the Logical Theory of Interrogatives;Åqvist,1965
2. How to Do Things with Words;Austin,1962
3. Fragesätze/questions;Bäuerle,1991
4. Approaches to the semantics of questions in natural language. Part I, Meaning, Use, and Interpretation of Language;Belnap,1981
5. Questions and answers in Montague grammar;Belnap,1982