Fairy Faith in Celtic Countries by W.Y Evans- Wentz

This book is a good source of fairy culture from Ireland, Britain, Scotland, Whales, Cornwall and the like. There are case studies as well as just general beliefs and stories. The author of this book is an anthropologist who went around the British Isles collecting fairy lore. He uses stories from the people he meets and later gets into different aspects of the fairy faith. This is a wonderful resource and a must read for all seriously obsessed with fairies.