Kurniawan, K., A. Yunita, and C. Christianingrum. “Increasing Agricultural Production By Utilizing Crab Shell Waste Into Organic Fertilizer On Seliu Island, Belitung Regency”. Jurnal Pengabdian Kepada Masyarakat Universitas Bangka Belitung, Vol. 4, no. 2, Aug. 2018, doi:10.33019/jpu.v4i2.177.