Y. Kusumawaty, E. Eliza, and G. Pangestra, “MARKETING STRATEGY FOR PROCESSED RUBBER MATERIALS IN THE APKARKUSI AUCTION SYSTEM IN GUNUNG VILLAGE GUNUNG TOAR SUB-DISTRICT KUANTAN SINGINGI DISTRICT”, J. ilm. sosio-ekon. bisnis, vol. 26, no. 02, pp. 51–64, Dec. 2023.