Can't you just like, sit down and figure out how to do it on your own?
I have already done so. I am stuck on the syntax-rules macro system. I want to read a book so that I can:
* See alternative implementations.
* See how syntax-rules is implemented.
I have tried. I really have. My Scheme interpreter has far more features than the one in SICP: more standard procedures, a defmacro-like macro system, quasiquotation, etc.