Susdarwono, E. T. and Surahmadi, S. (2022) “The Effectiveness of Promotional Tools in Making Covid-19 Vaccination a Success: Hypothesis Testing Methods for Changing Cochran’s Version”, QISTINA: Jurnal Multidisiplin Indonesia, 1(1), pp. 22–30. doi: 10.57235/qistina.v1i1.14.