“INFLUENCE PRICE RUBBER TO INCOME SIGALANGAN TRADITIONAL MARKET TRADERS, BATANG ANGKOLA DISTRICT, SOUTH TAPANULI REGENCY”. Journal Tropical Agricultural Inovation 1, no. 1 (November 22, 2025): 29–34. Accessed December 1, 2025. https://jurnal-alfatah.id/teknofarm/article/view/6.