Anugerah, Tirta, et al. “A Study on the Livelihood Sources and Welfare Levels of Small-Scale Fishing Households in Tapanuli Tengah Regency, Sumatera Utara”. International Journal of Marine Engineering Innovation and Research, vol. 9, no. 4, July 2025, pp. 659-66, doi:10.12962/j25481479.v9i4.4825.