Handayani, Ratna. “VARIASI PH, SUHU DAN WAKTU PADA EKSTRAKSI PEKTIN KULIT BUAH NAGA MERAH”. FaST - Jurnal Sains Dan Teknologi (Journal of Science and Technology), vol. 5, no. 1, May 2021, pp. 27-38, https://ojs.uph.edu/index.php/FaSTJST/article/view/3396.