* Update The Art of Assembly Language
Added PDF note, updated link to a PDF for easy downloading, added author and publication year.
* Remove personal PDF link
I removed the personal PDF link to Art of Assembly, and rolled it back to the original archive link. All my other (useful) changes remained.
* [Programming from the Ground Up](https://download-mirror.savannah.gnu.org/releases/pgubook/ProgrammingGroundUp-1-0-booksize.pdf) - Jonathan Bartlett (PDF)
* [Programming from the Ground Up](https://download-mirror.savannah.gnu.org/releases/pgubook/ProgrammingGroundUp-1-0-booksize.pdf) - Jonathan Bartlett (PDF)
* [Software optimization resources](http://www.agner.org/optimize/) - A. Fog
* [Software optimization resources](http://www.agner.org/optimize/) - A. Fog
* [The Art of Assembly Language Programming](https://web.archive.org/web/20120525102637/http://maven.smith.edu/~thiebaut/ArtOfAssembly/artofasm.html)
* [The Art of Assembly Language (2003)](https://web.archive.org/web/20120525102637/http://maven.smith.edu/~thiebaut/ArtOfAssembly/artofasm.html) - Randall Hyde (PDF)
* [Wizard Code, A View on Low-Level Programming](https://web.archive.org/web/20170712195930/http://vendu.twodots.nl/files/wizardcode4.pdf) - Tuomo Tuomo Venäläinen (PDF)
* [Wizard Code, A View on Low-Level Programming](https://web.archive.org/web/20170712195930/http://vendu.twodots.nl/files/wizardcode4.pdf) - Tuomo Tuomo Venäläinen (PDF)
* [x86-64 Assembly Language Programming with Ubuntu](http://www.egr.unlv.edu/~ed/x86.html) - Ed Jorgensen (PDF)
* [x86-64 Assembly Language Programming with Ubuntu](http://www.egr.unlv.edu/~ed/x86.html) - Ed Jorgensen (PDF)