Siahaan, Carolina, et al. ā€œImproving Students Ability in Writing Descriptive Text Through Self-Directed Learning for Eight Rade at SMP N 9 Pematangsiantarā€. Jurnal Pendidikan Tambusai, vol. 7, no. 1, Mar. 2023, pp. 2431-7, doi:10.31004/jptam.v7i1.5577.