1. Angelelli, I. (1976). Studies on Gottlob Frege and traditional philosophy. Dordrecht: D. Reidel.
2. Bergmann, G. (1959, 1968). Frege’s hidden nominalism. In Meaning and existence (pp. 205–224). Madison: The University of Wisconsin Press. See also Klemke (Ed.). (1968). Essays on Frege (pp. 42–63). Urbana: University of Illinois Press.
3. Bergmann, G. (1964). Ontological alternatives. In Logic and reality (pp. 124–157). Madison: The University of Wisconsin Press. See also Klemke (Ed.). (1968). pp. 113–156.
4. Cocchiarella, N. B. (1986). Frege. Russell, and logicism: A logical reconstruction. In Cocchiarella (1987), pp. 64–118. A somewhat longer version of this paper appeared in Haaparanta and Hintikka (Eds.), (1986). Frege synthesized (pp. 197–252). Dordrecht, Holland: D. Reidel.
5. Cocchiarella, N. B. (1987). Logical studies in early analytic philosophy. Columbus: Ohio State University Press.