1. Frege on Truth
2. Mathematical Creation in Frege’s Grundgesetze
3. Frege G.(1879). “Logik.” Unpublished manuscript (Date Unknown). Translated by Peter Long and Roger White as “Logic.” In Frege 1979: 1–8.
4. Frege G.(1892a). “Ausführungen über Sinn und Bedeutung.” Translated by Peter Long and Roger White as “Comments on Sense and Reference.” In Frege 1979: 118–125.