Angga Pramana, Farida Hamzah, P. Gultom, Okri Reval, Suci Rahmayani, and Syawatul Mutiara. “Producing Orange Marmalade in Pulau Belimbing 1 Kuok Village, Kuok Sub-Dstrick in Kampar Regency Riau”. Journal of Community Engagement Research for Sustainability, vol. 1, no. 1, July 2021, pp. 49-59, doi:10.31258/cers.1.1.49-59.