Coba jelasin Daftar conte dan adipati dari Kadipaten Puglia dan Calabria dong

William I Tangan Besi 1042–46

Houben, Hubert (translated by Graham A. Loud and Diane Milburn). Roger II of Sicily: Ruler between East and West. Cambridge: Cambridge University Press, 2002.

Matthew, Donald. The Norman Kingdom of Sicily. Cambridge: Cambridge University Press, 1992.

Norwich, John Julius. The Normans in the South 1016–1130. London: Longman, 1967.

Norwich, John Julius. The Kingdom in the Sun 1130–1194. London: Longman, 1970.

Takayama, Hiroshi. The Administration of the Norman Kingdom of Sicily. BRILL, 1993.