Supplementary literature for QFT

Nobody seems to be able to present the subject in a trouble-free manner... but there are good points in many references, such as:

Bjorken/Drell: Relativistic quantum mechanics (a bit dated, but works very well as a "tutorial" to supplement more modern books, since its approach is more practical/concrete)

L. Ryder: Quantum Field Theory  (intuitive and concise, easier to understand than Weinberg once the functional approach is accepted)

T. Lee: Particle physics and introduction to field theory (the path integral for the Schrödinger equation as it is presented here is a good point to start with, rather than just accepting ill-defined "completeness relations" in QFT)

R. Ticciati: Quantum Field Theory for Mathematicians (provides more arguments where other authors over-simplify, for example in the derivation of the Feynman rules from the path integral - unfortunately the book is often too cumbersome)

Bjorken/Drell: Relativistic quantum fields (lucid reference for 'traditional' QFT, i.e. canonical without path integrals)

P. Strange: Relativistic quantum mechanics (good explanation of the relation between single-particle wave functions and "second quantization")

A. Sudbery: Quantum mechanics and the particles of nature (quickly explains some essential points which in other books are buried in hundreds of pages of machinery)

A. Zee: Quantum Field Theory in a Nutshell (very fast and simple if you already have a good background, also covers many more topics than other books)

Also some of the original papers mentioned in Weinberg's book can be helpful, e.g. G.C. Wick, Phys. Rev. 80, 268; R.P. Feynman: Phys.Rev. 76, 769.