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Seneca the Younger - Wikipedia
List of Stoic philosophers - Wikipedia
Stoicism - Wikipedia
Stoicism | Definition, History, & Influence | Britannica
Stoicism - Stanford Encyclopedia of Philosophy
Seneca - Stanford Encyclopedia of Philosophy
Stoicism - Internet Encyclopedia of Philosophy
Roman Philosophy - World History Encyclopedia
Seneca (Stanford Encyclopedia of Philosophy/Winter 2009 Edition)
Musonius Rufus | Internet Encyclopedia of Philosophy