Hutami Endang, Andi, et al. “Design and Build English Spell Application With Image Objects As an Android-Based Early Childhood Learning Media: Rancang Bangun Aplikasi English Spell Dengan Objek Gambar Sebagai Media Pembelajaran Anak Usia Dini Berbasis Android”. JOINCS (Journal of Informatics, Network, and Computer Science), vol. 2, no. 1, Apr. 2019, pp. 5-9, doi:10.21070/joincs.v1i2.520.