Keltie, Sir John Scott (1875). "Chapter V: A.D. 1107 - A.D. 1411". A History of the Scottish Highlands, Highland Clans and Highland Regiments: With an Account of the Gaelic Language, Literature, and Music. Vol. I. Edinburgh and London: A. Fullarton. p. 59.
Lang, Andrew (2016). The History Of Scotland. Vol. 1: From The Romans to Mary of Guise. Altenmünster, Germany and North Charleston, SC: Jazzybee Verlag. p. 75. ISBN9783849685621.
Blumenthal, Uta-Renate (2004). "Calixtus II, Pope". In Kleinhenz, Christopher (ed.). Medieval Italy: An Encyclopedia. London and New York: Routledge. pp. 171–172. ISBN9781135948801.
Pelikan, Jaroslav (1979). "A First-Generation Anselmian, Guibert of Nogent". In Williams, George Huntston; Church, Frank Forrester; George, Timothy Francis (eds.). Continuity and Discontinuity in Church History: Essays Presented to George Huntston Williams on the Occasion of His 65th Birthday. Leiden, Netherlands: BRILL. p. 71. ISBN9789004058798.
doi.org
Bliese, John R. E. (2009-12-11). "The Courage of the Normans. A Comparative Study of Battle Rhetoric". Nottingham Medieval Studies. 35: 1–26. doi:10.1484/J.NMS.3.189.
Beech, George T. (1992). "The Eleanor of Aquitaine Vase: Its Origins and History to the Early Twelfth Century". Ars Orientalis. 22: 69–79. ISSN0571-1371. JSTOR4629425.
Beech, George T. (1992). "The Eleanor of Aquitaine Vase: Its Origins and History to the Early Twelfth Century". Ars Orientalis. 22: 69–79. ISSN0571-1371. JSTOR4629425.