Aromatherapy an A-Z is a first class book. I have used it as a health encyclopedia (along with a wonderful herb book ~ The New Holistic Herbal by David Hoffmann) for the last 13 years and refer to it constantly. Almost (!) all the information you could ever need on all aspects of aromatherapy from treatment and prevention of specific illnesses, history of plant use & methods of oil extaction, to cosmetic use (including recipes for cosmetic products), all in an easy to use A-Z 'dictionary' format. Includes information on related practices such as Yoga and Reflexology etc Everyone interested in their own health should own a copy of this insightful and indespensible book.
I have a comment however, about the latest edition of this book published by Vermilion.. Don't buy this book! It is of VERY poor quality (the paper used for the pages of the book particularly). If you want to get hold of a copy (which I highly recommend!) ~ try to get hold of an older edition (the 2000 edition still has exactly the same content as this latest edition) you can still get this older edition from the Random House on-line bookshop (who have taken over CW Daniel ~ the original publishers' books), and now also from Amazon.