Where can I find a good account of functional methods in QFT?

[simon.wang]

I'd like to be as familiar with functional methods as with calculus. Otherwise I always fell not to grasp QFT comprehensively.

Any help is much appreciated!

 

[StatMechGuy]

There's a very good Dover book by Schulman called "Techniques and Applications of Path Integration". It's pretty thorough and has most of the stuff about functional methods you might need, at least from the theory standpoint.

 

[simon.wang]

Thank you very much.

:!)