L.S., Yayu. “Bimbingan Belajar Matematika Bagi Anak Panti Asuhan Di Bandung Raya”. JURNAL PENGABDIAN KEPADA MASYARAKAT, vol. 3, no. 1, Aug. 2013, pp. 23-29, https://ojs.uninus.ac.id/JPKM/article/view/38.