Simarmata, J. S.; Limbong, T.; Tambunan, A.; Purnama Simanjuntak, M.; Limbong, R.; Purnomo, A.; Devi Kumalasari, R.; Anam, F.; Khoifulloh, K.; Nisa, K.; Aryni, Y.; Nirmala Purba, O.; Ariwisanto Sianturi, F.; Tarigan, P.; Napitupulu, E. Multimedia of Number Recognition for Early Childhood Using Image Object. IJET 2018, 7 (3.2), 796-798. https://doi.org/10.14419/ijet.v7i3.2.18760.