Model peningkatan resiliensi sistem sosio-hidrologis untuk keberlanjutan fungsi ekosistem sungai di Indonesia (Suatu kajian di wilayah sungai Citarum, provinsi Jawa Barat) = A model to enhance the resilience of socio-hydrological system for the sustainability of the river ecosystem services in Indonesia (A study in Citarum river basin, West Java Province)