Study Of The Effect Of Ethanol Addition And Solution Heating On The Determination Of Ammonia In Water By Indophenol Blue Method = Studi Pengaruh Penambahan Etanol dan Pemanasan Pada Penentuan Amonia dalam Air dengan.. - Perpustakaan UGM, i-lib ([Yogyakarta] : Universitas Gadjah Mada, 2002)