↑ Graham-Leigh, Elaine (2005). The southern French nobility and the Albigensian Crusade. Woodbridge, Suffolk, England: Boydell Press. pp.30–31. ISBN978-1-84615-429-4. OCLC666925270.
↑ Aubrey, Elizabeth (1996). The music of the troubadours. Bloomington: Indiana University Press. p.16. ISBN0-253-33207-9. OCLC34283373.
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