Liu, Yunxia, Kittawit Autchariyapanitkul, Ke Nunthasen, and Nirote Sinnarong. 2025. “The Impact of Population Aging on Economic Development in China: Insights from Heilongjiang, Hebei, and Hunan”. Interdisciplinary Academic and Research Journal 5 (6). Maha Sara Kham, TH.:837-58. https://doi.org/10.60027/iarj.2025.286770.