Larisma, Christian Caben M. 2017. “Does Vodcasting Increase The Achievement of The Students in Trigonometry of Higher Education Institutions (HEI)?”. Journal of Social Sciences (COES&Amp;RJ-JSS) 6 (2S):34-40. https://doi.org/10.25255/jss.2017.6.2S.34.40.