Topics in P. C.: Voting
Median Voter:
Here is an article written by Prof. Congleton which explan Median voter Model. This is part of encyclopedia of Pulic Choice.

Paradox of Voting:
Here is the first chapter of Bryan Caplan Book entitled " The Myth of the Rational Voter" which explane it.
Here is an article written by alexander Tabarrok which explan the paradox.


Arrow's Impossibility theorem:
Here is an article written by alexander Tabarrok which explan the theorem.