The source code for TeX, and for METAFONT are thought well of. Here's what Guy L. Steele has to say about them [1]: "... what I really recommend to you are Te

The source code for TeX, and for METAFONT are thought well of. Here's what Guy L. Steele has to say about them [1]: "... what I really recommend to you are TeX: The Program and METAFONT: The Program, because these are simply the best-written, best-documented, best-debugged programs of their size ever published. They reward careful study." I have to admit that I have not read all of them myself, but I have read parts of them, and think those parts are good. [1] https://web.archive.org/web/20050317063814/http://www.bookpool.com/ct/184 https://web.archive.org/web/20050317063814/http://www.bookpo...