There's Knuth's TeX Book and METAFONT Book, and his Stanford GraphBase book. There's also his collection of papers, Literate Programming (https://www.amazon.com/gp/product/0937073806/ref=dbs_a_def_r...).

Knuth has an LP web page (https://www-cs-faculty.stanford.edu/~knuth/lp.html), but it looks like the examples are out of date.

Probably more useful is http://www.literateprogramming.com/; the CWEB Tool page has some examples and the PDF Articles page has ... articles.

Here's an intro from Knuth: http://www.literateprogramming.com/knuthweb.pdf

And then there's Physically Based Rendering at http://www.pbr-book.org/.