Astuti, D. W., Fatimah, S., & Anie, S. (2016). ANALISIS KADAR KESADAHAN TOTAL PADA AIR SUMUR DI PADUKUHAN BANDUNG PLAYEN GUNUNG KIDUL YOGYAKARTA. Analit : Analytical and Environmental Chemistry, 1(1). https://doi.org/10.23960/aec.v1i1.2016.p