The Effect of Ratio of Old Coconut Water with Soursop Juice and Concentration of Natrium Bicarbonate (NaHCO3) on The Quality of Carbonated Coconut Water - Nasution, Zulaika Haddis; Program Studi Ilmu dan Teknologi Pangan, Fakultas Pertanian USU (Universitas Sumatera Utara, 2017)