1. Linthicum K. Why coal symbolises naughtiness. An object lesson. The Atlantic 2018. https://www.theatlantic.com/projects/object-lessons/
2. Bose S. Here’s why Santa Clause gives coal to naughty kids on Christmas. Republic World. 2019 Nov 26. https://www.republicworld.com/world-news/rest-of-the-world-news/heres-why-santa-clause-brings-coal-to-naughty-kids-on-christmas-day.html.
3. Philpot S. St Nicholas: naughty or nice? The History Vault. https://thehistoryvault.co.uk/st-nicholas-naughty-or-nice/.
4. Wikipedia. List of Christmas and winter gift-bringers by country. https://en.wikipedia.org/wiki/List_of_Christmas_and_winter_gift-bringers_by_country
5. Climate Change Act. 2008. UK Public General Acts 2008 c 27 Schedule 8: Carbon emissions reduction targets. Climate Change Act 2008, (up to date with all changes known to be in force on or before 11 August 2022). https://www.legislation.gov.uk/ukpga/2008/27/contents.