Quelle:
https://www.heraldscotland.com/life_style/16029520.fifty-years-britains-top-serial-killer-expert-re-examines-bible-john-murders/
https://www.dailyrecord.co.uk/news/uk-world-news/legendary-glasgow-detective-tells-believes-1052300
https://www.glasgowlive.co.uk/news/history/bible-john-killing-glasgow-barrowlands-11533797
https://www.vice.com/en_us/article/5947e5/the-mystery-of-bible-john-scotlands-zodiac-killer
https://www.zdf.de/dokumentation/zdfinfo-doku/auf-verbrecherjagd-der-serienkiller-peter-tobin-102.html
https://www.unsolvedcasebook.com/bible-john/
http://news.bbc.co.uk/2/hi/uk_news/8128188.stm
https://truecrimesociety.com/2019/07/26/the-many-crimes-of-serial-killer-peter-tobin/
https://unresolved.me/bible-john/
https://news.stv.tv/archive/1408962-former-detective-still-convinced-bible-john-is-behind-bars
https://de.wikipedia.org/wiki/Peter_Tobin
https://de.wikipedia.org/wiki/Bible_John
https://news.google.com/newspapers?id=yQUrAAAAIBAJ&sjid=EJgFAAAAIBAJ&pg=3386,3743142&dq
https://news.google.com/newspapers?id=OhQ-AAAAIBAJ&sjid=HEoMAAAAIBAJ&pg=6523,4393868&dq
https://news.stv.tv/archive/1408716-bible-john-victims-of-notorious-glasgow-serial-killer