Wirahadi Siregar, Najib, et al. “COMPETITIVE ANALYSIS OF GOAT FARMING INDUSTRY IN SIAK DISTRICT, RIAU PROVINCE”. 2025. Journal of Sustainable Entrepreneur Region Industry, vol. 3, no. 1, Feb. 2026, pp. 29-41, https://journal.ypmki.com/index.php/joseri/article/view/53.