short for the magic book < Structure and Interpretation of Computer Programs >
For better reading experience, you can find html version here:
Structure and Interpretation of Computer Programs
for testing the code, in the forth chapter, ex4.table.rkt and ex4.03.rkt is from
this site gives me a lot of help
wizardbook.wordpress.com
with the #lang planet neil/sicp,
some with plainly #lang racket or #lang sicp,
if without #lang, it is set to SICP in the left corner(it only shows up if you have ran #lang planet neil/sicp).