Kartika, Widya, Ahmad Albar, and Irsad Lubis. “Analysis of Influence Factors Labor Supply Class Elderly at Medan City”. International Journal of Social Science, Education, Communication and Economics (SINOMICS Journal) 2, no. 3 (July 15, 2023): 425–436. Accessed May 19, 2025. https://sinomicsjournal.com/index.php/sj/article/view/147.