Siregar, Mangihut, 		Kumbara, A.A. Ngurah, AND 		Wirawan, A.A. Bagus.
" CONTROVERSY OVER MANGASE UDAN RITUAL AT SIANJUR MULAMULA DISTRICT, SAMOSIR REGENCY, NORTH SUMATRA" <em>E-Journal of Cultural Studies</em> [Online], (1 February 2018)