Quellen Monster mit 21 Gesichtern

https://www.themonsterwith21faces.com/
https://unresolved.me/the-monster-with-21-faces
Überwachungsvideo: https://www.themonsterwith21faces.com/episode-4-video-archive
Brief Nr. 1: https://www.themonsterwith21faces.com/letter-4-2-84
Brief Nr. 2: https://www.themonsterwith21faces.com/letter-4-8-84
Brief Nr. 3: https://www.themonsterwith21faces.com/letter-4-16-84
Brief Nr. 4: https://www.themonsterwith21faces.com/episode-4-letter-archive-september-24th-1984
Brief Nr. 5: https://www.themonsterwith21faces.com/episode-4-letter-archive-october-8th-1984
https://en.wikipedia.org/wiki/Ezaki_Glico
Brief Nr. 6: https://www.themonsterwith21faces.com/episode-8-letter-archive-august-12th-1985
https://en.wikipedia.org/wiki/The_Monster_with_21_Faces
https://en.wikipedia.org/wiki/Glico_Morinaga_case
https://en.wikipedia.org/wiki/The_Monster_with_21_Faces