Folk Lore & Faerie and Folk Tales
Folk Tales of Brittany by Elsie Masson – https://www.amazon.com/Folk-Tales-Brittany-Elsie-Masson-ebook/dp/B0027ISB18/ref=sr_1_23?s=books&ie=UTF8&qid=1522043404&sr=1-23&keywords=Brittany+mythology
The Legend of the Sunken City in Welsh and Breton Tradition by James Doan – https://www.jstor.org/stable/1260254?seq=1#page_scan_tab_contents
Legends and Romances of Brittany by Lewis Spence – http://www.sacred-texts.com/neu/celt/lrb/index.htm
History & Culture
Landscapes of Neolithic Brittany 1st Edition by Chris Scarre – https://www.amazon.com/Landscapes-Neolithic-Brittany-Chris-Scarre/dp/0199281629/ref=sr_1_10?s=books&ie=UTF8&qid=1522042718&sr=1-10&keywords=Brittany+archaeology
Spirituality & Practices
The Fairy-Faith in Celtic Countries by W. Y. (Walter Yeeling) Evans-Wenthttps://www.amazon.com/Fairy-Faith-Celtic-Countries-Yeeling-Evans- – Wentz/dp/1297731034/ref=tmm_hrd_swatch_0?_encoding=UTF8&qid=&sr=