Harnas, D.M. and Hidayati, A. 2020. Pengembangan LIT Topik Keliling dan Luas Persegi Panjang Berbasis Pendekatan Realistic Mathematics Education di Sekolah Dasar. Jurnal Basicedu. 5, 1 (Nov. 2020), 77–87. DOI:https://doi.org/10.31004/basicedu.v5i1.567.