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- http://www.todayifoundout.com/index.php/2014/08/reason-fire-hydrants-dont-freeze-winter/
- http://media.cygnus.com/files/base/FHC/document/2011/09/weeklydrills34final_10461393.pdf
- http://media.cygnus.com/files/base/FHC/document/2011/11/weeklydrills43final0_10457995.pdf
- https://www.livescience.com/43408-why-do-freezing-pipes-burst.html
- https://www.plumbingsupply.com/residential-water-pressure-explained.html
- http://www.firehydrant.org/info/faqs_ask7.html
- https://books.google.nl/books?id=GUXyAAAAQBAJ&pg=PA495&redir_esc=y#v=onepage&q&f=false