Fairies and Elementals for Beginners by Alexandra Chauran
I thought that this book would be about the different fairies and spirits that people have believed in over the centuries. It does describe different types of 'elementals', but it's really a book about becoming close to them.
I liked it, but it's quite ethereal, and I haven't actually tried any of the suggestions. The one about absinthe is a bit dangerous, because it's such an addictive drink!