For those seeking a , the ethical and legal route is to purchase the Dover edition or access it through an institutional library. Unauthorized copies exist, but they undermine authors and publishers, and often offer poor scan quality. Recommendation: If you are a student starting QFT, begin with Peskin & Schroeder or Schwartz. Keep Itzykson & Zuber on your shelf (physical or legal e-copy) as a second reference for deep dives into renormalization and gauge theory formalities.
