Rachman, Nisrina Auliffia, and Mohammad Il Badri. “Exploring Colonial Historiography A Study on John Th. Petrus Blumberger and His Writings on the Internal Conflicts of Sarekat Islam (1917-1923)”. Criksetra: Jurnal Pendidikan Sejarah, vol. 14, no. 2, Aug. 2025, pp. 181-95, doi:10.36706/jc.v14i2.70.