Source: cirosantilli/an-introduction-to-qed-and-qcd-by-jeff-forshaw-1997
= An Introduction to QED and QCD by Jeff Forshaw (1997)
{c}
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.