Blank, David L. (1985-01-01). "Socratics versus Sophists on Payment for Teaching". Classical Antiquity. 4 (1): 1–49. doi:10.2307/25010822. JSTOR25010822.
Versenyi, Laszlo (1962-01-01). "Protagoras' Man-Measure Fragment". The American Journal of Philology. 83 (2): 178–184. doi:10.2307/292215. JSTOR292215.
Clarke, M. L. (April 1968). "Cicero at School". Greece & Rome. Second Series. 15 (1). Cambridge University Press on behalf of The Classical Association: 18–22. doi:10.1017/s001738350001679x. JSTOR642252. S2CID162158134.
Eyre, J.J. (March 1963). "Roman Education in the Late Republic and Early Empire". Greece & Rome, Second Edition. 10 (1). Cambridge University Press: 47–59. doi:10.1017/s0017383500012869. JSTOR642792. S2CID162790971.
jstor.org
Blank, David L. (1985-01-01). "Socratics versus Sophists on Payment for Teaching". Classical Antiquity. 4 (1): 1–49. doi:10.2307/25010822. JSTOR25010822.
Versenyi, Laszlo (1962-01-01). "Protagoras' Man-Measure Fragment". The American Journal of Philology. 83 (2): 178–184. doi:10.2307/292215. JSTOR292215.
Clarke, M. L. (April 1968). "Cicero at School". Greece & Rome. Second Series. 15 (1). Cambridge University Press on behalf of The Classical Association: 18–22. doi:10.1017/s001738350001679x. JSTOR642252. S2CID162158134.
Eyre, J.J. (March 1963). "Roman Education in the Late Republic and Early Empire". Greece & Rome, Second Edition. 10 (1). Cambridge University Press: 47–59. doi:10.1017/s0017383500012869. JSTOR642792. S2CID162790971.
Clarke, M. L. (April 1968). "Cicero at School". Greece & Rome. Second Series. 15 (1). Cambridge University Press on behalf of The Classical Association: 18–22. doi:10.1017/s001738350001679x. JSTOR642252. S2CID162158134.
Eyre, J.J. (March 1963). "Roman Education in the Late Republic and Early Empire". Greece & Rome, Second Edition. 10 (1). Cambridge University Press: 47–59. doi:10.1017/s0017383500012869. JSTOR642792. S2CID162790971.
stanford.edu
plato.stanford.edu
"The Sophists". Stanford Encyclopedia of Philosophy. 2020.
stoa.org
Blackwell, Christopher. "Demos: Classical Athenian Democracy". 28 February 2003. The Stoa: a Consortium for Scholarly Publication in the Humanities. 25 April 2007.