- Frege
 - Offers a personal and professional bio of Gottlob Frege, the principal founder of modern symbolic logic, who argued that mathematics is reducible to logic. - Gottlob Frege
- Offers quotes, book information, and papers related to German philosopher Gottlob Frege.
- Internet Encyclopedia of Philosophy: Gottlob Frege
- Encyclopedia article on German logician, mathematician, and philosopher Gottlob Frege. Includes Frege's contributions to philosophy, logic, and his formulations on sense and reference.
- Stanford Encyclopedia of Philosophy: Gottlob Frege
- Encyclopedia on the life and works of the German philosopher Gotlob Frege. Includes Frege's work on the philosophy of mathematics, his formulation of predicate logic, and his work on the philosophy of language.
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