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2. 2. Frolov, Je. D. (2004). Rozhdenie grecheskogo polisa [The rise of the Greek polis] (2nd ed.). Sankt-Peterburg: Izdatel'stvo Sankt-Peterburgskogo universiteta. (In Russian).
3. Archaeology and the Study of the Greek Polis.;Snodgrass,1991
4. 4. Chernyshev, B. S. (1929). Sofisty [Sophists]. Moskva: Ranion. (In Russian).
5. 5. Losev, A. F. (1969). Istorija antichnoj jestetiki [The History of Ancient Esthetics] (Vol. 2: Sofisty. Sokrat. Platon.). Moskva: Iskusstvo. (In Russian).