Yandri, Pitri. “Consumer Preferences for Coconut Shell Charcoal in Suburban Indonesia”. International Research Journal of Business Studies 6, no. 2 (August 1, 2013): 121–132. Accessed December 4, 2025. https://irjbs.prasetiyamulya.ac.id/index.php/jurnalirjbs/article/view/781.