Situmeang M, BR. Silalahi RJ, Purba R. Morphological Processes Found in Umpasa and Umpama of Tobanese "Pesta Na Monding”. jiwp [Internet]. 20Dec.2021 [cited 25May2026];7(8):558-65. Available from: https://www.jurnal.peneliti.net/index.php/JIWP/article/view/1205