From Citizendium, the Citizens' Compendium
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- References for Pythagoras
- "Pythagoras" — Internet Encyclopedia of Philosophy]
- "Pythagoras of Samos" — The MacTutor History of Mathematics archive
- "Pythagoras and the Pythagoreans, Fragments and Commentary" — Arthur Fairbanks, Hanover Historical Texts Project, Hanover College Department of History
- The Complete Pythagoras — an on-line book containing all survived biographies and Pythagorean fragments.
- "Pythagoras and Pythagoreanism" — The Catholic Encyclopedia]
- "Pythagoras" — Stanford Encyclopedia of Philosophy