Stuttaford, Andrew (6 July 2009). "The Heart of Darkness". AndrewStuttaford.com. Archived from the original on 27 September 2016. Retrieved 26 September 2016.
Smith 1980, p. 591. Smith, Canfield F. (1980). "The Ungernovščina – How and Why?". Jahrbücher für Geschichte Osteuropas. 28 (4): 590–595. JSTOR41046201.
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tikhanovlibrary.com
* Alioshin, Dmitri. Asian Odyssey. Tikhanov Library, 2023. "Asian Odyssey"
Stuttaford, Andrew (6 July 2009). "The Heart of Darkness". AndrewStuttaford.com. Archived from the original on 27 September 2016. Retrieved 26 September 2016.