Gurusinga, Bryan, 		Perwira, Ima, AND 		Waskitasari, Alfi.
" Kandungan Nutrien (Nitrat dan Fosfat) di Sungai Seruai, Sumatera Utara" <em>Current Trends in Aquatic Science</em> [Online], Volume 5 Number 2 (19 August 2022)