1. Haney, Kathleen (2018). Listening to Edith Stein. Wisdom for a New Century. A Collection of Essays, ISC Publications.
2. Ayer, Alfred Jules (1959). Logical Positivism, The Free Press of Glencoe.
3. Beckmann, Beate (2003). Phänomenologie des religiösen Erlebnisses. Religionsphilosophische Überlegungen im Anschluß an Adolf Reinach und Edith Stein, Königshausen & Neumann.
4. Benedict XVI (2023, April 20). General Audience: “Oasis” of the Spirit. August 10. Vatican Digital Archive. Available online: https://www.vatican.va/content/benedict-xvi/en/audiences/2011/documents/hf_ben-xvi_aud_20110810.html.
5. Logical Positivism, Language and the Reconstruction of Metaphysics;Bergmann;Rivista Critica Di Storia Della Filosofia,1953