Only the books and articles actually referred to in the paper will be listed here.

Aristotle. [1].

Metaphysica. (Works, vol. VIII.) English translation by W. D. Ross. Oxford, 1908.

Carnap, R. [1].

Logical Syntax of Language. London and New York, 1937.

Carnap, R. [2].

Introduction to Semantics. Cambridge, 1942.

Gödel, K. [1].

"Über formal unentscheidbare Sätze der Principia Mathematica und verwandter Systeme, I." Monatshefte für Mathematik und Physik, vol. XXXVIII, 1931, pp. 173-198.

Gödel, K. [2].

"Über die Länge von Beweisen." Ergebnisse eines mathematischen Kolloquiums, vol. VII, 1936, pp. 23-24.

Gonseth, F. [1].

"Le Congrès Descartes. Questions de Philosophie scientifique." Revue thomiste, vol. XLIV, 1938, pp. 183-193.

Grelling, K., and Nelson, L. [1].

"Bemerkungen zu den Paradoxien von Russell und Burali-Forti." Abhandlungen der Fries'schen Schule, vol. II (new series), 1908, pp. 301-334.

Hofstadter, A. [1].

"On Semantic Problems." The Journal of Philosophy, vol. XXXV, 1938, pp. 225-232.

Hilbert, D., and Bernays, P. [1].

Grundlagen der Mathematik. 2 vols. Berlin, 1934-1939.

Juhos, B. von.[1].

"The Truth of Empirical Statements." Analysis, vol. IV, 1937, pp. 65-70.

Kokoszynska, M. [1].

"Über den absoluten Wahrheitsbegriff und einige andere semantische Begriffe." Erkenntnis, vol. VI, 1936, pp. 143-165.

Kokoszynska, M. [2].

"Syntax, Semantik und Wissenschaftslogik." Actes du Congrès International de Philosophie Scientifique, vol. III, Paris, 1936, pp. 9-14.

Kotarbinski, T. [1].

Elementy teorji poznania, logiki formalnej i metodologji nauk. (Elements of Epistemology, Formal Logic, and the Methodology of Sciences, in Polish.) Lwow, 1929.

Kotarbinski, T. [2].

"W sprawie pojecia prawdy." ("Concerning the Concept of Truth," in Polish.) Przeglad filozoficzny, vol. XXXVII, pp. 85-91.

Lindenbaum, A., and Tarski, A. [1].

"Über die Beschränktheit der Ausdrucksmittel deduktiver Theorien." Ergebnisse eines mathematischen Kolloquiums, vol. VII, 1936, pp. 15-23.

Nagel, E. [1].

Review of Hofstadter [1]. The Journal of Symbolic Logic, vol. III, 1938, p. 90.

Nagel, E. [2].

Review of Carnap [2]. The Journal of Philosophy, vol. XXXIX, 1942, pp. 468-473.

Ness, A. [1].

" 'Truth' As Conceived by Those Who Are Not Professional Philosophers." Skrifter utgitt av Det Norske Videnskaps-Akademi i Oslo, II. Hist. Filos. Klasse, vol. IV, Oslo, 1938.

Neurath, 0. [1].

"Erster Internationaler Kongress für Einheit der Wissenschaft in Paris 1936." Erkenntnis, vol. V, 1935, pp. 377-406.

Russell, B. [1].

An Inquiry Into Meaning and Truth. New York, 1940.

Scholz, H. [1].

Review of Studia philosophica, vol. I. Deutsche Literaturzeitung, vol. LVIII, 1937, pp. 1914-1917.

Tarski, A. [1].

"Sur les ensembles définissables de nombres réels. I." Fundamenta mathematicae, vol, XVII, 1911, pp, 210-239.

Tarski, A. [2].

"Der Wahrheitsbegriff in den formalisierten Sprachen." (German translation of a book in Polish, 1933.) Studia philosophica, vol. I, 1935, pp. 261-405.

Tarski, A. [3].

"Grundlegung der wissenschaftlichen Semantik." Actes du Congrès International de Philosophie Scientifique, vol. III, Paris, 1936, pp. 1-8.

Tarski, A. [4].

"Über den Begriff der logischen Folgerung." Actes du Congrès International de Philosophie Scientifique, vol. VII, Paris, 1937, pp. 1-11.

Tarski, A. [5].

"On Undecidable Statements in Enlarged Systems of Logic and the Concept of Truth." The Journal of Symbolic Logic, vol. IV, 1939, pp. 105-112.

Tarski, A. [6].

Introduction to Logic. New York, 1941.

Weinberg, J. [1].

Review of Studia Philosophica, vol. I. The Philosophical Review, vol. XLVII, pp. 70-77.