HARDIYANTI, O.; NURMANINA, A. Analysis of The Utilization of the Social Center for Orangutan Protection (COP) In Kalimantan in Orangutan Saving Efforts: Analisis Pemanfaatan Jaringan Sosial Centre for Orangutan Protection (COP) di Kalimantan Dalam Upaya Penyelamatan Orangutan. Progress In Social Development, v. 1, n. 1, p. 9-17, 2 Jan. 2020.