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“Channel Islands Profile - Overview,” BBC, March 2015, https://www.bbc.com/news/world-europe-18175986.
“Descriptive Sketch of the Island of Sark,” The Guernsey Magazine: A Monthly Illustrated Journal of Useful Information, Instruction, and Entertainment, Vol. 3, No. 5, 1875.
“Guernsey resistance to German occupation 'not recognized’,” BBC, October 2014, https://www.bbc.com/news/world-europe-guernsey-29443105.
Rick Hale, “Guernsey’s Haunted German Military Underground Hospital,” Spooky Isles, June 2019, https://www.spookyisles.com/german-military-underground.
Edouard Launet, “Michael Beaumont, 70 ans, est le «seigneur» de Sercq, île anglo-normande. Deux richissimes jumeaux contestent son paisible féodalisme. Le comte de l'île.” Libération, December 1997, https://www.liberation.fr/portrait/1997/12/06/michael-beaumont-70-ans-est-le-seigneur-de-sercq-ile-anglo-normande-deux-richissimes-jumeaux-contest_224306.
Edgar MacCulloch, Guernsey Folk Lore: a collection of popular superstitions, legendary tales, peculiar customs, proverbs, weather sayings, etc., of the people of that island (public domain, 1903).