Dr Geoff Lindsey | Schwa /ə/ and STRUT /ʌ/ vowels in EVERY English accent (almost) @DrGeoffLindsey | Uploaded August 2022 | Updated October 2024, 34 minutes ago.
How schwa /ə/ (aka commA) and /ʌ/ (aka STRUT) occur throughout the entire English-speaking world, using John Wells's famous "Accents of English" as our guide.

Accents of English by J. C. Wells, Cambridge 1982
cambridge.org/core/books/accents-of-english/1E9E89C38DFD0AB53B47EF96D8442594

English Accents & Dialects by Hughes, Trudgill & Watt, Routledge 2012
routledge.com/English-Accents-and-Dialects-An-Introduction-to-Social-and-Regional-Varieties/Hughes-Trudgill-Watt/p/book/9781444121384