I Ketut Darma, I Gede Made Karma, I Made Anom Santiana, and I Wayan Suastawa. “Effect Size of Mathematics Blended Learning Design on Increasing Mathematical Problem-Solving Ability of Polytechnic Students in the Covid-19 Pandemic Period”. Logic : Jurnal Rancang Bangun Dan Teknologi, vol. 22, no. 1, Mar. 2022, pp. 43-50, doi:10.31940/logic.v22i1.43-50.