O'Connor, John: Paul Adrien Maurice DiracSchool of Mathematics and Statistics University of St Andrews, Scotland. lokakuu 2003. Arkistoitu 14.3.2009. Viitattu 20.10.2018.
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O'Connor, John: Paul Adrien Maurice DiracSchool of Mathematics and Statistics University of St Andrews, Scotland. lokakuu 2003. Arkistoitu 14.3.2009. Viitattu 20.10.2018.