Burhan, Burhan, Suherman Suherman, and Paulus Hengky Abram. “Determination of Sodium (Na) and Calcium (Ca) Levels in Sea Water at Posona Village”. Media Eksakta 17, no. 1 (May 31, 2021): 57-61. Accessed December 4, 2024. https://jurnalfkipuntad.com/index.php/jme/article/view/821.