Ploeger, Jan. “OORLOGSDAGBOEKIE VAN H. S. OOSTERHAGEN, JANUARIE-JUNIE 1902”. Scientia Militaria - South African Journal of Military Studies 6, no. 2 (November 5, 2011). Accessed April 25, 2024. https://scientiamilitaria.journals.ac.za/pub/article/view/861.