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- Prawitz, Dag (1965). Natural deduction: A proof-theoretical study. Acta Universitatis Stockholmiensis, Stockholm studies in philosophy 3. Stockholm, Göteborg, Uppsala: Almqvist & Wicksell.
- Prawitz, Dag (2006) . Natural deduction: A proof-theoretical study. Mineola, New York: Dover Publications. ISBN 978-0-486-44655-4.
- "Gruppe 3: Idéfag" (in Norwegian). Norwegian Academy of Science and Letters. Retrieved 16 January 2011.
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