quantum field theory - Is there a mistake in a QFT textbook? - Physics Stack Exchange

I tried to calculate one of the problems in the textbook Gauge Theory of Elementary Particle Physics by Ta-Pei Cheng and Ling-Fong Li. On page 248 you can find the following calculation of a loop

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Used Book in Good Condition Highlight, take notes, and search in the book In this edition, page numbers are just like the physical edition

Quantum Mechanics and Quantum Field Theory: A Mathematical Primer

Introduction to Quantum Field Theory: Classical Mechanics to Gauge Field Theories: Williams, Anthony G.: 9781108470902: : Books

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296 questions with answers in QUANTUM FIELD THEORY

The Mystery at the Heart of Physics—That Only Math Can Solve

harmonic oscillator - Spring-mass analog for quantum field theory? - Physics Stack Exchange

Student Friendly Quantum Field Theory Volume 1: Basic Principles and Quantum Electrodynamics: Klauber, Robert D: 9780984513949: : Books

resource recommendations - Comprehensive book on group theory for physicists? - Physics Stack Exchange

Are there any good books for the lay reader that focus on Quantum Field Theory, ones that don't require knowledge of the math behind the theory? - Quora