Tobing, Andrew P.L., Himpun Panggabean, and Tengku Silvana Sinar. 2017. “Effect-for-Cause Inferencing in the Evaluation of Loudness Among Toba Batak People”. Sociolinguistic Studies 10 (3): 455-74. https://doi.org/10.1558/sols.v10i3.28869.