http://www.amazon.com/Seidr-Working-Trance-Prophecy-Witchcraft-ebook/dp/B0079LCRTA/ref=sr_1_1?s=books&ie=UTF8&qid=1438535830&sr=1-1&keywords=Seidr%3A+The+Gate+Is+Open I thought this was a well researched book on the history. Not a lot of detail on how to practice but a good foundation.