Wirawan Yogiyatno. “Initiating the Development of the Ubiquitous Learning Environment As a Projection of the Ubiquitous Environment in South Korea”. Ideguru: Jurnal Karya Ilmiah Guru, Vol. 4, no. 1, Oct. 2019, pp. 84-94, doi:10.51169/ideguru.v4i1.86.