* {{Cite book|author=M. Peskin and |author2=D. Schroeder, ''|title=An Introduction to Quantum Field Theory'' |publisher=Addison-Weasley, |___location=Reading, |year=1995}}
* {{Cite book|author=M. Srednicki, ''[|url=http://www.physics.ucsb.edu/~mark/qft.html http://www.physics.ucsb.edu/~mark/qft.html|title=Quantum Field Theory]''}}
* {{Cite book|author=T. Gehrmann, ''[|url=https://www.mitschriften.ethz.ch/main.php?page=3&details=161 https://www.mitschriften.ethz.ch/main.php?page=3&details=161|title=Quantum Field Theory 1]''}}
