Just bought this book a couple of weeks ago. It looks like it will be a good reference book for oils. It refers to doTerra products, but you can easily figure out which oils work best from other essential oil companies as well. I wanted to have a reference that wasn’t online too, so if the power is out or there is an emergency out of range, I can still look things up. Being reliant on the internet is not ideal when it comes to medical issues!