^Melhuish, Martin (1998). Celtic Tides: Traditional Music in a New Age. Ontario, Canada: Quarry Press Inc. pp. 8, 28. ISBN1-55082-205-5.
^Alberro, Manuel (2005). "Celtic Legacy in Galicia". E-Keltoi: Journal of Interdisciplinary Celtic Studies. 6: 1005–1035. Archived from the original on 1 June 2013. Retrieved 16 August 2011.