Margareta, R. et al. 2025. Collaborative Governance in Airspace Sovereignty: Managing the Indonesia Singapore FIR the Kepulauan Riau–Natuna. Journal of Cultural Analysis and Social Change. 10, 3 (Dec. 2025), 2707–2719. DOI:https://doi.org/10.64753/jcasc.v10i3.2827.