Widiarto, Ony, 		Sugiyanto, Sugiyanto, AND 		Marjono, Marjono.
" THE ROLE OF SULTAN HAMENGKU BUWONO IX IN UPHOLDING INDONESIAN INDEPENDENCE IN 1945-1950" <em>JURNAL HISTORICA</em> [Online], Volume 4 Number 2 (9 December 2020)