Good morning! I saw this list in my email box this morning, and wanted to add a few thoughts for those health professionals out there (or those science minds who want even more science).
The first book I ever bought (and interestingly it was the one that convinced me to go with Young Living even though it is not YL specific) is Essential Oil Safety by Tisserand and Young. The first several chapters outline all the important features of a quality essential oil ( I knew immediately YL was the choice for me after reading this VIP information)!
The next book I bought is Aromatherapy for Health Professionals by Price and Price. It’s a FABULOUS book and loaded with very precise information on therapeutic properties of essential oils.
Another great book is Evidence Based Essential Oil Therapy by Dr. Scott A. Johnson. It is a concise easy to read resource with hundreds (if not thousands) of cited studies you can access online if you want to dive into deep science.