Probably The Moon is a Harsh Mistress, also. that one is on my list but I haven't read it yet
Alongside Night ; Schulman
A Lodging of Wayfaring Men ; Rosenberg
Atlas Shrugged ; Rand
Agora, the book ; http://anarplex.net/hosted/files/agora.txt
Discussion
That book is the source of the concept of a rational anarchist. Definitely worth your time.