Biography.com: Critias
Very brief biographical information.
Critias
Article from the Internet Encyclopedia of Philosophy by William Morison. Notes his life, relationship with Socrates, and various philosophical teachings.
Critias
Biographical article from In2greece.com, focusing on Critias' role in the catastrophic Thirty Tyrants dictatorship of Athens.
Critias: Fragment 9
A snippet of tragic poetry attributed to this classical Greek writer.