https://web.archive.org/web/20190429070545/https://abeldanger.blogspot.com/2015/07/2393-marine-brief-pinkerton-gps-hotel.html

https://www.facebook.com/matt29680

https://nypost.com/2020/10/11/the-pinkertons-are-older-than-fbi-once-saved-abraham-lincoln/