Iswardhani, Diar, Rudi Wibowo, & Anik Suwandari.
" ANALISIS EFISIENSI PG WATOETOELIS  KABUPATEN SIDOARJO." <em>JSEP (Journal of Social and Agricultural Economics)</em> [Online], 9.1 (2016): 33-40. Web.  4 May. 2024