↑Rosamond Mckitterick, The Frankish Kingdoms under the Carolingians (Pearson Education Limited, 1999.), 360-361.
↑"ADALBERT [Albert], son of HERIBERT Comte de Vermandois & his wife Adela [Capet] (-8 Sep 987)."
↑Christian Settipani, La Préhistoire des Capétiens (Nouvelle histoire généalogique de l'auguste maison de France, vol. 1), 1993. ISBN978-2-95015-093-6.
↑James Neill (2011). The Origins and Role of Same-Sex Relations in Human Societies. McFarland. ISBN978-0786469260.