Guilherme I da Sicília (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Guilherme I da Sicília" in Portuguese language version.

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books.google.com

Baedeker (Firm), Karl (1887). Italy, Handbook for Travellers: Southern Italy and Sicily with excursions to the Lipari islands, Malta, Sardinia, Tunis, and Corfu (em inglês). Leipsic: K. Baedeker. p. xlvi
Falcando, Ugo (1998). The History of the Tyrants of Sicily by "Hugo Falcandus," 1154-69 (em inglês). Manchester: Manchester University Press. p. 13