I can also recommend the following books by Nils M Holm: LISP From Nothing (https://t3x.org/lfn/ https://t3x.org/lfn/) LISP System Implementation (https://www

I can also recommend the following books by Nils M Holm: LISP From Nothing (https://t3x.org/lfn/ https://t3x.org/lfn/) LISP System Implementation (https://www.t3x.org/lsi/ https://www.t3x.org/lsi/) Scheme 9 from Empty Space (https://t3x.org/s9book/ https://t3x.org/s9book/) They're more leaning towards the LISP implementation side, and far less on the learning C side, for which there are far better options.