Bali number = Jogjakarta number
Batavia C Travellers Official Information Berean of the Netherlands Indies 1938-1939
 Buku Teks
Selo Soemardjan
Social changes in Jogjakarta
Cornell University Press, 1962
 Buku Teks SO
Mudjanattistomo
Katalogus manuskrip Kraton Jogjakarta
Lembaga Bahasa Nasional Tjabang II, 1971
 Buku Teks
Republik Indonesia : daerah Istimewa Jogjakarta
Indonesia. Kementerian Penerangan
Kementerian Penerangan, 1953
 Buku Referensi
R.M. Wasisto Surjodiningrat
Tone measurements of outstanding Javanese gamelans in Jogjakarta and Surakarta
Gadjah Mada University Press, 1993
 Buku Teks SO