By far my favourite book for every oil user, The Essential Life Book.
The perfect essential oil reference guide for either the novice & expert oil user. Fully updated with the latest research & expertly written to help you quickly find the perfect oil or oil blend. This essential oil reference guide provides easy to use steps, usage tips, and advice along with in-depth, expert-level knowledge.
The Essential Life Book includes in-depth information about each oil, blend, and supplement as well as blend ideas for all aspects of life.
Also, included are resources and recipes for cooking, green cleaning, blend making, first aid and more. You will learn something new every time you pick it up.