Quantum Field Theory (PPT)

http://equella.nottingham.ac.uk/uon/file/15d27091-3d0b-f39d-928a-78eb359f90d5/1/Quantum%20Field%20Theory.zip/Quantum%20Field%20Theory/output7.pdf

 

http://www.physics.umd.edu/courses/Phys851/Luty/notes/diagrams.pdf