https://en.wikipedia.org/wiki/Murder_of_Sophie_Hook
https://www.heraldscotland.com/news/12127046.house-of-laughter-silenced-as-garden-adventure-ended-in-rape-and-death/
https://www.heraldscotland.com/news/12093753.jemma-said-i-want-to-be-in-heaven-to-be-with-her-thats-very-difficult-for-us-hook-family-ripped-apart-by-murder-of-sophie/
https://crimesandcuriosities.medium.com/a-little-girl-was-abducted-from-her-garden-and-brutally-murdered-b4ca47b5a67c
https://web.archive.org/web/20160304004137/http://innocent.org.uk/cases/howardhughes/index.html
https://www.walesonline.co.uk/news/wales-news/sophie-hook-murder-gerry-davies-9679720