books.google.com - This book introduces QFT for readers with no prior knowledge of the subject. It is meant to be a textbook for advanced undergraduate or beginning postgraduate students. The book discusses quantization of fields, S-matrix theory, Feynman diagrams, calculation of decay rates and cross sections, renormalization,...https://books.google.com/books/about/A_First_Book_of_Quantum_Field_Theory.html?id=_UmPP8Yr5mYC&utm_source=gb-gplus-shareA First Book of Quantum Field Theory
