A Critical Introduction to the Philosophy of Gottlob Frege
Guillermo E. Rosado Haddock
Klemke, E.D. (ed.), Essays on Frege (Urbana: University of Illinois Press, 1968). Kluge, E.H.W., The Metaphysics of Gottlob Frege (Den Haag: M. Nijhoff, 1980). Kreiser, Lothar, Gottlob Frege: Leben-Werk-Zeit (Hamburg: Felix Meiner, 2001).