Betsy Aardsma

"Murder in the Stacks" av David DeKok
https://books.apple.com/us/book/murder-in-the-stacks/id916106774

https://www.statecollegemagazine.com/articles/blood-burden/
https://medium.com/@Charlie_OBrien/who-murdered-penn-state-stubetsy-aardsma-bed047f68dd2
https://www.centredaily.com/living/article42872370.html
https://www.nbcnews.com/dateline/cold-case-spotlight/unsolved-murder-penn-state-student-betsy-aardsma-haunts-community-52-n1284867
https://www.oxygen.com/crime-news/betsy-aardsma-murder-mystery-still-surrounds-death-of-penn-state-student

Zodiac
https://www.zodiacciphers.com/zodiac-news/the-creation-of-a-zodiac-suspect

"Who Killed Betsy?" av Derek Sherwood (Jag har inte läst den här boken men länkar den ändå om du vill läsa den själv)
https://www.amazon.se/-/en/Mr-Derek-Sherwood/dp/0615498116