Putra, Sapta Eka, Widya Rahmawati, and Anggun Savira. “The Effect of Product Development and Product Quality Control on Sales Volume of Yakult Products in Indarung District, Padang City”. INVEST : Jurnal Inovasi Bisnis dan Akuntansi 3, no. 2 (November 22, 2022): 258-266. Accessed July 5, 2025. http://www.journal.al-matani.com/index.php/invest/article/view/980.