The following publications contain information about Olas Northeg:

Article: "Olans Northeg" • 7th Cavalry Troopers in South Dakota • Scott Nelson, Webmaster • Accessed 3 June 2020.

Article: "Haunted by history: Tragedy followed Bighorn battle survivors" by Lorna Thackeray • Billings Gazette • June 21, 2009 • Pages E1 and E3.