Perancangan Prototype Aplikasi Transaksi  Pembelian Gas LPG 3kg Menggunakan MIT App Inventor dengan Metode Design Thinking (Studi Kasus Pangkalan Lpg 3kg Bapak Romuska Avito). IPSSJ. 2026;3(09 September):211-221. Accessed October 21, 2026. https://ipssj.com/index.php/ojs/article/view/1982