Siallagan, S. and Pasaribu, P. (2024) “Strategi Membangun Solidaritas pada Persekutuan Remaja Naposobulung HKBP Air Bersih”, SAKOLA: Journal of Sains Cooperative Learning and Law, 1(2), pp. 271–278. doi: 10.57235/sakola.v1i2.3271.