* شجرة عائلة سكيبو بوليوس جراكوس* آبيا (Appian)، "الحرب الأهلية"* "The Great Books", Encyclopædia Britannica, "Plutarch - The Lives of the Noble Grecians and Romans" (Dryden translation), 1952, Library of Congress Catalog Card Number: 55-10323* Ian Scott-Kilvert, notes to "Life of Tiberius Gracchus" by Plutarch; Penguin Classics* BBC - Ancient Rome: The Rise and Fall of an Empire Episode 4 - 2006 (Television series and accompanying book of same title)