There is one: PSR...
As a matter of fact, the only person in the world with a degree in Magic from UC Berkeley, Isaac Bonewits, wrote a book called
Real Magic, which is actually the thesis for his degree, updated through a couple of editions and the newest century. He also pieced together a book called
Authentic Thaumaturgy for first Chaosium and then Steve Jackson Games. It has the feel of AD&D, but it's loose enough to adapt however.
What I do recommend though is reading
Real Magic and seeing how an in depth treatment and well-researched book on the "occult" deals with it. It will give you ideas for applying things to a basic Psionic system like in Classic Traveller, incrementally, and if your psionic characters are well-versed with their abilities, and you'll add it to your IMTU rules, let them read the book. Hell, have them buy the book! It ain't that expensive, and they can refer to it as needed.
But as a little carrot out there, it'll really work with the proposed T5 system...!
If you're having a hard time seeing what I'm talking about, check out
Authentic Thaumaturgy, it'll spell out the interrelationships for you.
http://en.wikipedia.org/wiki/Authentic_Thaumaturgy
http://en.wikipedia.org/wiki/Isaac_Bonewits#Bibliography