The following sources provide a terrifying insight into the crimes of the Golden State killer and helped Tara and Jill immensely in preparing the I'll be Gone in the Dark episode.
Michelle McNamara, I'll Be Gone in the Dark, One Woman's Obsessive Search for the Golden State Killer, Harper Collins, New York, 2018.
ABC7 Presents - Chasing the Golden State Killer
Golden State Killer Site
ID Golden State Killers- It's not over yet
"I'm going to kill you" from ABC To Catch a Killer
Killer Instinct - Inside the hunt for the GSK with Investigator Paul Holes
Oxygen: GSK the Main Suspect