“Temperature f Gold Mineralization In Tugurejo Area and Its Surrounding, Slahung Subdistrict, Ponorogo District, East Java Province, Indonesia” (2022) iJournals:International Journal of Software & Hardware Research in Engineering ISSN:2347-4890, 10(4). पर उपलब्ध: https://ijournals.in/journal/index.php/ijshre/article/view/103 (अंतिम उपयोग: 22 अक्टूबर 2026).