1. Ajdukiewicz, K. (1936). Die Definition [Definition]. In Actes du Congrès International de Philosophie Scientifique, Sorbonne, Paris, 1935, V Logique et expérience (Actualités Scientifiques et Industrielles 392, pp. 1–7). Hermann.
2. Ajdukiewicz, K. (1960). Definicja [Definition]. In his Język i poznanie, Tom I. Wybór pism z lat 1920–1939 [Language and knowledge. Vol. I: Selected writings from the years 1920–1939] (pp. 44–61). Wydawnictwo Naukowe PWN.
3. Frege, G. (1903). Grundgesetze der Arithmetik [Fundamental laws of arithmetic], II. Hermann Pohle.
4. Geach, P., & Black, M. (1970). Translations from the philosophical writings of Gottlob Frege (2nd ed.). Basil Blackwell.
5. Gruber, M. (2016). Alfred Tarski and the “Concept of truth in formalized languages”: A running commentary with consideration of the Polish original and the German translation. Springer.