Analysis of information sources in references of the Wikipedia article "Socratic problem" in English language version.
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Cicero translated Oeconomicus)
Our earliest extant source—and the only one who can claim to have known Socrates in his early years—is the playwright Aristophanes. His comedy, Clouds, was produced in 423 when the other two writers of our extant sources, Xenophon and Plato, were infants.