Leni; Ike Betria. UPAYA PELESTARIAN TRADISI MANDAI ULU TAON DI DESA KAITI KECAMATAN RAMBAH KABUPATEN ROKAN HULU: EFFORTS TO PRESERVE THE MANDAI ULU TAON TRADITION IN KAITI VILLAGE RAMBAH DISTRICT ROKAN HULU REGENCY. bjsse 2022, 2, 151-158.