Donald Knuths surprisingly friendly manual of the TeX macro language.
Edit: Removed the link to the pdf, which is available online in various places, because of copyright. The source is freely available to read, but not to make your own document.
Donald Knuths surprisingly friendly manual of the TeX macro language.
Edit: Removed the link to the pdf, which is available online in various places, because of copyright. The source is freely available to read, but not to make your own document.
True, maybe it would be better to have step by step instructions on how to compile your own TeXbook, since the source is free?
Edit: it seems like it’s actually not 100% free to produce a pdf from the source.