http://www.debian.org/doc/FAQ/ch-pkg_basics.en.html
http://cop.pn.psu.ac.th/smf/index.php?topic=25.0
http://en.wikipedia.org/wiki/Aptitude_(program)
e-book Ubuntu® Linux® Toolbox: 1000+ Commands for Ubuntu and Debian Power Users
สำนักพิมพ์ Wiley Publishing
