T, Mulyadi A, et al. “The Effect of Sonic Bloom Fertilizing Technology on The Seed Germination and Growth of Acacia Mangium Willd Seedling”. Jurnal Manajemen Hutan Tropika, vol. 11, no. 1, Nov. 2012, p. 67, https://journal.ipb.ac.id/jmht/article/view/%20%3Cp%20class%3D%22MsoBodyTextIndent2%22%20style%3D%22text-align%3Ajustify%3Btext-i.