“Identification Of Potential Mangrove Resources In The Coastal District Of Simpang Pesak East Belitung Regency As An Alternative For Sustainable Ecotourism Development: Identifikasi Potensi Sumberdaya Mangrove Di Pesisir Kecamatan Simpang Pesak Kabupaten Belitung Timur Sebagai Alternatif Pengembangan Ekowisata Berkelanjutan”, jpu, vol. 3, no. 2, Aug. 2018, doi: 10.33019/jpu.v3i2.150.