Source: /cirosantilli/an-introduction-to-qed-and-qcd-by-jeff-forshaw-1997

= An Introduction to QED and QCD by Jeff Forshaw (1997)
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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.