A History of Greek Philosophy: Volume 1, The Earlier Presocratics and the Pythagoreans

A History of Greek Philosophy: Volume 2, The Presocratic Tradition from Parmenides to Democritus

The Sophists

Socrates

A History of Greek Philosophy: Volume 4, Plato: The Man and his Dialogues: Earlier Period (Plato - The Man & His Dialogues - Earlier Period)

A History of Greek Philosophy: Volume 5, The Later Plato and the Academy (Later Plato & the Academy)

A History of Greek Philosophy: Volume 6, Aristotle: An Encounter

Orpheus and Greek Religion (Mythos Books)

The Greek Philosophers: From Thales to Aristotle

Plotinus: Volume I, Porphyry on Plotinus, Ennead I (Loeb Classical Library No. 440)

Orpheus and the Roots of Platonism