Lahagu, A. I. B., O. Laia, Y. Mendrofa, and Y. Zalukhu. “Analysis of Marketing Strategies to Increase Sales of Building Materials at UD Tokosa West Nias District”. ProBisnis : Jurnal Manajemen, vol. 15, no. 2, Apr. 2024, pp. 228-32, https://ejournal.joninstitute.org/index.php/ProBisnis/article/view/514.