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www.facebook.com/What-Had-Happened-A-True-Crime-Podcast-182561450126558

Twitter@whathadhappe5

IG/whathadhappenedtcpc

https://en.wikipedia.org/wiki/Richard_Cottingham

https://stephaniemanzo.wixsite.com/richardcottingham/victims

https://murderpedia.org/male.C/c/cottingham-richard.htm

https://criminalminds.fandom.com/wiki/Richard_Cottingham

https://hellandhighhorror.tumblr.com/post/190784022029/richard-cottingham-the-times-square-ripper

https://newjerseygirlmurders.org/cases.htm

https://youtu.be/b5pZztSzLbc

https://timesmachine.nytimes.com/timesmachine/1981/06/02/issue.html

https://www.newspapers.com/clip/19525170/1979-01-14-helen-sikes-daily-news/

https://www.nytimes.com/1979/01/15/archives/the-city-simon-to-appoint-cuevas-as-deputy-jury-still-out-in.html

https://www.newspapers.com/clip/19508960/torso-helen-sikes-daily-news-06-jan-1980/

Serial Violence: Analysis  Modus Operendi and Signature Characteristics of Killers by Robert D. Keppel and William J. Birnes

http://www.sonsofcainserialkillers.com/illustrations.htm

https://listverse.com/2019/04/26/10-horrific-facts-about-the-times-square-ripper

https://newjerseygirlmurders.org/cases.htm