Chartaruchirakorn, K. “Influence of Chemical Fertilizer and Farmyard Manure on Thai Geen Stem Kenaf Fiber”. Thai Agricultural Research Journal, vol. 3, no. 1, Jan. 1985, pp. 13-16, https://li01.tci-thaijo.org/index.php/thaiagriculturalresearch/article/view/245226.