I use aromatherapy a lot and recently was looking for some desk references by happy accident I ended up with the exact same books and would recommend them to any newbie. My issue was I knew lots about native plants in my area but not much about the more exotic plants out there so these books where a great help for filling in the blanks.
I wish the USA regulated essential oils at least a little because there is just so much misinformation and a lot of people dismiss it out of hand when it is a great medical tool when used correctly and with good material. I had tried ordering some sandalwood online and the crap I ended up with was more like pine sol than sandalwood very frustrating.
I had this problem as well. I ended up going to a vitamin supplement store to get mine. The oils were very good quality and a price to match which I expect from good quality product. In general I try to avoid any website or store that has a witchy theme because there are so many ignorant people out there that sell their wares after reading a few books.
This is the store where I picked up mine although I shopped in person so I could smell each oil that I purchased rather than online.