Like I said, you can provide an appropriate scientific reference from a document.
Hmm, I gave you Feynman's preferred forms of Shrodinger's and Einstein's equations. For some odd reason I thought you capable of grasping their significance, apparently I was mistaken.
Let me explain it in simple terms that anyone of reasonable intelligence should be able to understand. Between the two equations we have a simple principle and that is that energy and mass are both wave functions and interchangeable. In other words light and matter are both wave functions, i.e. the same thing.
So what kind of references would you like? I am partial to books like the New Quantum Universe or The Feynman Lectures on Physics. You may want to start with Feyman's chapter on the Special Theory of Relativity. Those are both relatively basic sources that can get you pointed in the right direction.