Sulasiwi, I., S. Handayanto, and W. Wartono. “Eksplorasi Keterampilan Self-Directed Learning (SDL) Siswa SMA: A Descriptive Research Study”. Momentum: Physics Education Journal, Vol. 3, no. 1, June 2019, pp. 42-52, doi:10.21067/mpej.v3i1.3345.