Bedelbayeva, M. “New Materials from the Archive of A.I. Schrenk: Towards the History of the Creation of the Karkaraly Fortification: Research Article”. Gumilyov Journal of History 152, no. 3S1 (October 25, 2025): 32–47. Accessed December 7, 2025. https://jhistory.enu.kz/index.php/jHistory/article/view/89.