Studio Arcanis

I was interested in knowing what some others would say is their personal favorite book for practical results. Not this or that well-known book that was just interesting to read, or this book is sort of classic and should be on a list because of that---but the book that really resonated with you and where you really feel that some good results occurred or probably occurred due to working with the material. Feel free, of course, to elaborate on any tips that you may feel would be helpful guidance.