Naming and Necessity by Kripke is about reference and the causal theory of reference, but it assume a decent amount (in case that is what you were asking for specifically).
The Very Short Introductions series have some really good booklets if you want quick ways to jump into a topic.
A few other books:
B Russell The Problems of Philosophy. OUP (dated, but a classic general introduction)
Simon Blackburn Think. Oxford (nice general introduction)
Tim Crane The Mechanical Mind. Penguin (Nice introduction to phil of mind)
A J Ayer Language, Truth, and Logic. Penguin (dated, but a classic)
D Hume Enquiries
T Kuhn The Structure of Scientific Revolutions. Univ of Chicago Press
http://www.philosophybites.com/
Check out Stanford Encyclopedia of Philosophy, which is free and edited by active research philosophers on pretty much every major topic and figure.
http://plato.stanford.edu/
Naming and Necessity by Kripke is about reference and the causal theory of reference, but it assume a decent amount (in case that is what you were asking for specifically).
The Very Short Introductions series have some really good booklets if you want quick ways to jump into a topic.
A few other books:
B Russell The Problems of Philosophy. OUP (dated, but a classic general introduction)
Simon Blackburn Think. Oxford (nice general introduction)
Tim Crane The Mechanical Mind. Penguin (Nice introduction to phil of mind)
A J Ayer Language, Truth, and Logic. Penguin (dated, but a classic)
D Hume Enquiries
T Kuhn The Structure of Scientific Revolutions. Univ of Chicago Press