Course Lecture Notes:

The complete set of course lecture notes is available here:

QFT Lecture Notes (full) (last updated: October 17, 2007)

Other references:

Quantum Field Theory by David Tong (Cambridge) - these lecture notes follow the same general lines as this course, but with different emphasis in places.  Highly recommended.

Andrew Blechman (currently a postdoc in the particle theory group here) has written “A Mathematics Primer for Physics Graduate Students” - the first few chapters, in particular, deal with four-vectors, covariant vs. contravariant vectors, tensors, etc.

The first volume of Sidney Coleman’s QFT Lecture Notes from Harvard - handwritten by Brian Hill (scanned pdf files).  Part One  Part Two

(NEW!)  The original videos from Coleman’s course (recorded in the mid-70’s) are available here.

Freeman Dyson’s 1951 QFT Lecture Notes

A short note by Michael Dine (UC Santa Cruz) on “Lorentz Invariance and the Lorentz Group”.

Marc Srednicki’s QFT text (currently available free on the web).