https://en.wikipedia.org/wiki/George_Oldfield_(police_officer)
https://www.theguardian.com/commentisfree/2020/nov/15/women-sutcliffe-attack-institutional-sexism
https://en.wikipedia.org/wiki/Wearside_Jack
https://www.thesun.co.uk/tv/13485304/yorkshire-ripper-netflix-documentary-peter-sutcliffe/
https://en.wikipedia.org/wiki/Peter_Sutcliffe
https://www.standard.co.uk/news/crime/peter-sutcliffe-yorkshire-ripper-story-police-mistakes-b69345.html
https://www.mirror.co.uk/news/uk-news/who-yorkshire-ripper-peter-sutcliffe-8616762
https://www.aetv.com/real-crime/peter-sutcliffe-family-life#:~:text=Sutcliffe%2C%20born%20on%20June%202,father%20from%20an%20early%20age.
https://www.independent.co.uk/news/uk/home-news/yorkshire-ripper-peter-sutcliffe-secret-funeral-b1763145.html
https://www.bbc.co.uk/news/resources/idt-sh/the_ripper_and_the_swedish_murders
https://www.psychologytoday.com/intl/blog/shadow-boxing/202012/the-yorkshire-ripper-and-the-fbi