Guilherme I, Conde de Bolonha (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Guilherme I, Conde de Bolonha" in Portuguese language version.

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1books.google.com

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books.google.com

Gill, Jean (2020). Song Hereafter: 1153: Hispania and the Isles of Albion (em inglês). [S.l.]: The 13th Sign. p. 362. ISBN 9791096459049

google.com.br

Crouch, David (2014). The Reign of King Stephen: 1135-1154. Abingdon-on-Thames: Taylor & Francis. p. 356. ISBN 9781317892977
Tanner, Heather (2004). Families, Friends and Allies: Boulogne and Politics in Northern France and England, c.879-1160 (em inglês). Leida: BRILL. p. 181. ISBN 9789047402558