https://www.guyhadleigh.com/blog/gerard-schaefer-serial-killer-cop
https://www.foxnews.com/us/florida-murder-case-susan-poole-police
https://www.forensicmag.com/586882-Genealogy-IDs-Teen-Murdered-in-1974-Could-be-Killer-Cop-Victim/
https://www.palmbeachpost.com/story/news/crime/2025/09/10/serial-killers-florida-cop-killer-casanova-killer-cases/85872865007/
https://murderpedia.org/male.S/s/schaefer-gerard.htm
https://www.kiro7.com/news/trending/florida-jane-doe-identified-after-nearly-48-years-may-be-victim-serial-killer-cop/EVQOSTZJ6VDSFOFMJV7UKLMGWI/
The Descent of a Serial Killer, season 1 episode 1
https://www.findagrave.com/
https://www.youtube.com/watch?v=bAn-eGWf_XU.
https://www.youtube.com/watch?v=MA41yu_aQQ8.
https://www.missingkids.org/poster/NCMC/1080042/1.
https://websleuths.com/threads/fl-gerard-schaefer-how-many-victims-1969-1973.34741/.
https://charleyproject.org/
https://youtu.be/axY-2QEDlIQ.