an excellent intro textbook for GT. Here is its link on Amazon, FYI:
http://www.amazon.com/Essentials-Game-Theory-Multidisciplinary-Introduction/dp/1598295934

Game theory is the mathematical study of interaction among independent,self-interested agents. The audience for game theory has growndramatically in recent years, and now spans disciplines as diverse aspolitical science, biology, psychology, economics, linguistics,sociology, and computer science, among others. What has been missing isa relatively short introduction to the field covering the common basisthat anyone with a professional interest in game theory is likely torequire. Such a text would minimize notation, ruthlessly focus onessentials, and yet not sacrifice rigor. This Synthesis Lecture aims tofill this gap by providing a concise and accessible introduction to thefield. It covers the main classes of games, their representations, andthe main concepts used to analyze them.