An Introduction to QED and QCD by Jeff Forshaw (1997) | 🗖 nosplit | ↑ parent "Quantum field theory lecture notes" | 12

http://www.hep.man.ac.uk/u/forshaw/NorthWest/QED.pdf https://web.archive.org/web/20200824083133/http://www.hep.man.ac.uk/u/forshaw/NorthWest/QED.pdf

These seem very direct and not ultra advanced, good read.