"The Wonder of it all: Philosophy (600-30 BCE)" by Vernon Provencal (chapter 18)
Themes in Greek Society and Culture: an Introduction to Ancient Greece
Edited by Alison Glazebrook; Christina Vester Second Edition
Approximate section timestamps:
00:02:52.5 The Presocratic Sphinx of Early Greek Philosophy (600-450 BCE)
00:06:12.5 Humanism and the Sophists (450-400 BCE)
00:11:37.5 A Good Idea: Socrates, Plato, and Aristotle (Fourth Century BCE)
00:33:18 Hellenistic Philosophy and Individualism (Third to First Centuries BCE)
00:36:45.5 Thematic Overview