What is a good reference for a geometrical viewpoint on the calculus of variations for physics, using differential forms etc. to derive Yang-Mills equations and other topics of the standard model?
Thanks for ideas.



literature on geometrical viewpoint on calculus of variations for physics
I think that the book 


* David Bleecker: *Gauge Theory and Variational Principles*, Addison-Wesley, 1981


contains exactly what you are looking for. 


