Muhdi, Muhdi, 		Risnasari, Iwan, AND 		Bayu, Eva.
" PENDUGAAN CADANGAN BIOMASSA DI ATAS PERMUKAAN TANAH PERKEBUNAN KELAPA SAWIT DI SUMATERA UTARA" <em>Bumi Lestari</em> [Online], Volume 15 Number 1 (26 January 2016)