Essential oil complete use manual: more than 320 kinds of essential oil formulas for beauty, age reduction, slimming, tranquilizing, decompression and refreshing and their own use are comprehensive for beginners, but there are inevitably omissions or misleading places.
Encyclopedia of Essential Oils-When We Fall in Love with Aroma is a major, but its content is rigorous. You can also have a look. The writer is Ms. Jin Yunrong, the chief representative of the International Association of Aromatherapy Therapists in Greater China.
There are many such books on Amazon or Dangdang. You can search for keywords: essential oil or fragrance. Look at other people's comments and decide which book is more suitable for you!