Chandra, Martin Purnama. “Efektivitas Sister City Dalam Perspektif Keamanan Non-Tradisional”. Jurnal International & Diplomacy Universitas Satya Negara Indonesia 2, no. 2 (June 1, 2017): 309–324. Accessed October 19, 2025. https://jurnalhiusni.org/index.php/idu/article/view/143.