Romero, J.L. Estado y sociedad en el mundo antiguo, c1980 p. 12 (Tiberio Graco)
Gaïos Grakchos, 1993 p. 9 (Tiverios, 162-133 B.C.)
Enkykl. Papyros Larous Britannika, c1984 (Tiverius Semprōnios Grakchos; Tiberius Sempronius Gracchus, 169/164-133 B.C.; older brother of Gaius Sempronius Gracchus, 154-121 B.C. Tiberius was murdered during an uprising instigated by his rivals in the Roman Senate)