Widyaningrum, I., and W. W. “PENERAPAN ALAT PERAGA PIPA LOGIKA PADA MATERI LOGIKA MATEMATIKA DI KELAS X”. JOURNAL of MATHEMATICS SCIENCE and EDUCATION, Vol. 2, no. 1, Dec. 2019, pp. 12-23, doi:https://doi.org/10.31540/jmse.v2i1.445.