Unsolved Mysteries with Robert Stack - Season 3, Episode 10
https://web.archive.org/web/20150524162051/http://www.nytimes.com/1985/05/01/us/missing-children-and-the-busiest-phones-in-town.html
https://charleyproject.org/case/nyleen-kay-marshall
https://childfindofamerica.org/nyleen-marshall/
https://www.missingkids.org/poster/NCMC/601812/1
https://www.doenetwork.org/cases/266dfmt.html
https://www.kxlh.com/news/2017/02/07/cold-case-what-happened-to-nyleen-marshall/
https://apnews.com/article/229a9abc20ce48409f091d6913767d02
https://medium.com/@chelsealynnqueen94/disappearance-of-nyleen-marshall-0afd7ea68dfe
https://web.archive.org/web/20170401015304/https://missoulian.com/news/state-and-regional/nyleen-kay-marshall/article_95139a67-8704-51a7-9617-e4f55a56d33c.html
https://www.latimes.com/archives/la-xpm-1990-12-26-me-6529-story.html
https://www.newspapers.com/article/the-billings-gazette/24957972/
https://morbidology.com/the-disappearance-of-nyleen-marshall/
https://lostnfoundblogs.com/f/nyleen-kay-marshall-statistic-or-sadistic
https://www.facebook.com/photo?fbid=899887840173060&set=a.745780915583754
https://web.archive.org/web/20070519090344/http://www.channel3000.com/news/1555573/detail.html
https://discover.hubpages.com/politics/follow-the-shadow-the-mysterious-disappearance-of-4-year-old-nyleen-kay-marshall
https://www.youtube.com/watch?v=YXwX5zIYU1Q