Nugroho, Catur, Wisma Nugraha Christianto, and Sugeng Bayu Wahyono. “History of the Yogyakarta Monarchy: From the Islamic Kingdom to Being Imprisoned in the Indonesian Democratic System”. Historia Madania: Jurnal Ilmu Sejarah 5, no. 1 (June 19, 2021): 32–48. Accessed December 6, 2025. https://journal.uinsgd.ac.id/index.php/historia/article/view/12126.