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2. Beaney M. . [2005]: ‘Sinn, bedeutung and the paradox of analysis’, in [Beaney and Reck, ], ch. 62, pp. 288–310.
3. Beaney M. , and Reck E.H. , eds [2005]: Gottlob Frege. Critical Assessments of Leading Philosophers. Vol. IV. London and New York: Routledge.
4. Blanchette P. [2012]: Frege's Conception of Logic. Oxford University Press.
5. Frege on Extensions of Concepts, from 1884 to 1903