Ardiansyah, Rezki, and Isna Wijayani. “Marketing Strategy to Improve Export Services of PT. Varuna Tirta Prakasya (Persero) in National Market Competition”. Jurnal Mantik 6, no. 3 (September 9, 2022): 2683-2692. Accessed June 19, 2026. https://iocscience.org/ejournal/index.php/mantik/article/view/2924.