1. Lukasiewicz,J.,“Philosophische Bemerkungen zu mehrwertigen Systemen des Aussagenkalküls”, Comptes rendus des séances de la Société des Sciences et des Lettres de Varsovie, Cl. III, 23, 1930, pp. 51–77; reprinted as “Philosophical remarks on many-valued systems of propositional logic” in [2], pp. 153–178.
2. Lukasiewicz, J., Selected Works, North-Holland, Amsterdam, and PWN—Polish Scientific Publishers, Warszawa, 1970.
3. Lukasiewicz, J., Die logischen Grundlagen der Wahrscheinlichkeitsrechnung, Acad. der Wiss. Krakow, 1913; reprinted as “Logical foundations of probability theory” in [2], pp. 16–63.
4. Lukasiewicz, J., “O logice trojwartosciowej”, Ruch Filozoficzny, 5, 1920, pp. 170–171; reprinted as: “On three-valued logic” in [2], pp. 87–88.
5. Post, E. L., “Introduction to a general theory of elementary propositions”, Bulletin of the American Mathematical Society, 26, 1920, p. 437.