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Books about Hamengkubuwono:
Inaugural address by Vice President Hamengkubuwono IX;: Delivered at the general session of the People's Consultative... by Hamengku Buwono (1973)
Sultan in Oorlogstijd: Hamengkubuwono Ix En De Bezetting Van Yogyakarta in, 1948 / 49 by P. J. Drooglever (1996)
Wiki information Hamengkubuwono:
Hamengkubuwono is the current ruling royal house of the Yogyakarta Sultanate in the Yogyakarta Special Region of Indonesia. The current Sultan is Hamengkubuwono X.
Hamengkubuwono IX or HB IX was the first Governor of the Special Region of Yogyakarta, the second Vice President of Indonesia and the ninth Sultan of Yogyakarta during the rule of Suharto.