The book "Quantum Field Theory" by Itzykson and Zuber is widely available online in PDF format. However, please note that some links may be broken or violate copyright laws. You can try searching for the book on academic databases or online libraries, such as ResearchGate or Academia.edu.
The material is designed for researchers and graduate-level students in particle physics, assuming a strong background in electrodynamics, relativity, and complex analysis. Digital Access and Legal Availability quantum field theory itzykson zuber pdf