American Heritage Dictionary of the English Language: Aristippus of Cyrene: Definition and pronunciation guide, including WAV sound file.
Aristippus: Article from the Internet Encyclopedia of Philosophy on this founder of the Cyrenaic school, by Tim O'Keefe.
Aristippus of Cyrene: Notes from a philosophy class session focusing on this ancient hedonist.
Diogenes Laertius Lives of the Philosophers: Aristippus: C.D. Yonge's translation of this collection of ancient anecdotes.
Great Books: Aristippus: Intellectual profile from Malaspina.