Editing Propagator (section)

==References==
*{{cite book|last1=Bjorken|first1=J.|author-link1=James Bjorken|last2=Drell|first2=S.|author-link2=Sidney Drell|title=Relativistic Quantum Fields|url=https://archive.org/details/relativisticquan0000bjor_c5q0|url-access=registration|location=New York|publisher=[[McGraw-Hill]]|year=1965|isbn=0-07-005494-0}} (Appendix C.)
*{{cite book|last1=Bogoliubov|first1=N.|author-link1=Nikolay Bogolyubov|last2=Shirkov|first2=D. V.|author-link2=Dmitry Shirkov|title=Introduction to the theory of quantized fields|publisher=[[Wiley-Interscience]]|isbn=0-470-08613-0|year=1959}} (Especially pp.&nbsp;136–156 and Appendix A)
* {{cite book | last=Cohen-Tannoudji | first=Claude | last2=Diu | first2=Bernard | last3=Laloë | first3=Franck | title=Quantum Mechanics, Volume 1 | publisher=John Wiley & Sons | publication-place=Weinheim | date=2019| isbn=978-3-527-34553-3}}
*{{cite book|editor-last1=DeWitt-Morette|editor-first1=C.|editor-link1=Cécile DeWitt-Morette|editor-last2=DeWitt|editor-first2=B.|editor-link2=Bryce DeWitt|title=Relativity, Groups and Topology|publisher=[[Blackie and Son]]|location=Glasgow|isbn=0-444-86858-5}} (section Dynamical Theory of Groups & Fields, Especially pp.&nbsp;615–624)
*{{cite book|title=Quantum Electrodynamics|first1=W.|last1=Greiner|author-link1=Walter Greiner|first2=J.|last2=Reinhardt|edition=4th|year=2008|isbn=9783540875604|publisher=[[Springer Verlag]]|url=https://books.google.com/books?id=5Kd3dBL8a64C&q=walter+greiner+Quantum+electrodynamics}}
*{{cite book|title=Field Quantization|first1=W.|last1=Greiner|author-link1=Walter Greiner|first2=J.|last2=Reinhardt|year=1996|isbn=9783540591795|publisher=Springer Verlag|url=https://archive.org/details/fieldquantizatio0000grei|url-access=registration}}
*{{cite book|last=Griffiths|first=D. J.|title=Introduction to Elementary Particles|location=New York|publisher=[[John Wiley & Sons]]|year=1987|isbn=0-471-60386-4}}
*{{cite book|last=Griffiths|first=D. J.|title=Introduction to Quantum Mechanics|location=Upper Saddle River|publisher=[[Prentice Hall]]|year=2004|isbn=0-131-11892-7}}
*{{citation|last1=Halliwell|first1=J.J.|last2=Orwitz|first2=M.|title=Sum-over-histories origin of the composition laws of relativistic quantum mechanics and quantum cosmology|journal=Physical Review D|volume=48|issue=2|pages=748–768|arxiv=gr-qc/9211004|bibcode = 1993PhRvD..48..748H |doi = 10.1103/PhysRevD.48.748 |pmid=10016304|year=1993|s2cid=16381314}}
*{{cite book|last=Huang|first=Kerson|author-link=Kerson Huang|title=Quantum Field Theory: From Operators to Path Integrals|location=New York|publisher=John Wiley & Sons|year=1998|isbn=0-471-14120-8}}
*{{cite book|last1=Itzykson|first1=C.|author-link1=Claude Itzykson|last2=Zuber|first2=J-B.|author-link2=Jean-Bernard Zuber|title=Quantum Field Theory|url=https://archive.org/details/quantumfieldtheo0000itzy|url-access=registration|location=New York|publisher=McGraw-Hill|year=1980|isbn=0-07-032071-3}}
*{{cite book|last=Pokorski|first=S.|title=Gauge Field Theories|location=Cambridge|publisher=[[Cambridge University Press]]|year=1987|isbn=0-521-36846-4}}  ''(Has useful appendices of Feynman diagram rules, including propagators, in the back.)''
*{{cite book|last=Schulman|first=L. S.|title=Techniques & Applications of Path Integration|publisher=John Wiley & Sons|location=New York|year=1981|isbn=0-471-76450-7}}
*Scharf, G. (1995). ''Finite Quantum Electrodynamics, The Causal Approach.'' Springer. {{ISBN|978-3-642-63345-4}}.