1. S. Soemardjan, In Memoriam: Hamengkubuwono IX, Sultan of Yogyakarta, 1912-1988, INDONESIA. 3 (1989) 115-117.
2. B. Setiawan, Local dynamics in informal settlement development: A case study of Yogyakarta, Indonesia, ProQuest Diss Theses. (1998) 315–415.
3. B. Yossi, E.E. Sajor, Development of Riverside Kampungs and Management of Rivers in Yogyakarta, Indonesia: Issues of Policy Coherence and Relevance of Socio-Economic Characteristics of River Bank Communities., Reg Conf Urban Water Sanit Southeast Asian Cities. (2006) 297–311.
4. Pengambilan Sampel Air Sungai Gajah Wong di Wilayah Kota Yogyakarta;Ahdiaty;IJCA (Indonesian Journal of Chemical Analysis),2020
5. UN ESCAP, Pro-poor Water and Wastewater Management in Small Town. 2007;1–4., (2007).