One word on this. Be careful how you tread here on this. It has proven in the past to be a volatile issue. I know from personal experience. Concerning this issue, many will beny but you might be able to find early texts such as the Book of Thoth when RUNA was known as R.A. Straughn. Those early books he published are long out of print. Here is a link for one I have been trying to find for years. The subject material even predates the common usage of the word "Kemetic".
http://www.amazon.com/dp/0917650026/?tag=destee0b-20
What I suggest even with the Metu Neter is referencing the Bibliography. Obviously, RUNA does not reference a single spiritual framework.
Peace
Here is another link
http://www.novelguide.com/a/discover/ear_01/ear_01_00141.html