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↑ Approaches to the Study of Sound Structure and Speech: Interdisciplinary Work in Honour of Katarzyna Dziubalska-Kołaczyk. Magdalena Wrembel, Agnieszka Kiełkiewicz-Janowiak and Piotr Gąsiorowski. (21 October 2019). pp. 1–398. ISBN 9780429321757. https://books.google.com/books?id=hh24DwAAQBAJ&q=h+dropping+north+wales&pg=PT22
1 2 3 4 5 6 Crystal (2003), p. 335.
↑ The British Isles. Bernd Kortmann and Clive Upton. (2008-12-10). ISBN 9783110208399. https://books.google.com/books?id=EeXI43AwwiEC&q=north+west+wales+accent++%2Fz%2F&pg=PA117 2019年1月31日閲覧。
↑ Wells (1982), p. 390.
↑ “Why butty rarely leaves Wales”. Wales Online (2006年10月2日). 2015年2月22日閲覧。
↑ Edwards, John (1985). Talk Tidy. Bridgend, Wales, UK: D Brown & Sons Ltd.