Angga Pramana; Farida Hamzah; Gultom, P.; Okri Reval; Suci Rahmayani; Syawatul Mutiara. Producing Orange Marmalade in Pulau Belimbing 1 Kuok Village, Kuok Sub-Dstrick in Kampar Regency Riau. CERS 2021, 1, 49-59.