Puyada, D., and R. Putra. “Meta Analisis Pengaruh Problem Based Learning Dan Virtual Laboratory Terhadap Hasil Belajar Siswa”. INVOTEK: Jurnal Inovasi Vokasional Dan Teknologi, Vol. 18, no. 2, July 2018, pp. 9-16, doi:https://doi.org/10.24036/invotek.v18i2.257.