An Introduction to Quantum Field TheoryAn Introduction to Quantum Field Theory is a textbook intended for the graduate physics course covering relativistic quantum mechanics, quantum electrodynamics, and Feynman diagrams. The authors make these subjects accessible through carefully worked examples illustrating the technical aspects of the subject, and intuitive explanations of what is going on behind the mathematics. After presenting the basics of quantum electrodynamics, the authors discuss the theory of renormalization and its relation to statistical mechanics, and introduce the renormalization group. This discussion sets the stage for a discussion of the physical principles that underlie the fundamental interactions of elementary particle physics and their description by gauge field theories. 
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I agree with Mostafa. This book is definitely not for beginners. It is not an introduction.
If you want a solid introductory text, find a copy of Schweber.
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errata online:
http://www.slac.stanford.edu/~mpeskin/QFT.html
Other editions  View all
An Introduction To Quantum Field Theory Michael Edward Peskin,Daniel V. Schroeder Limited preview  1995 
An Introduction to Quantum Field Theory, Student Economy Edition Michael E. Peskin,Daniel V. Schroeder No preview available  2015 