Zai, F., S. Tampubolon, and H. Silitonga. “The Effect of Locus in Control Teaching Strategy on Students Speaking Skills at Smp Negeri 7 Lawe Sigala-Gala”. Jurnal Riset Ilmu Pendidikan, vol. 5, no. 2, May 2025, pp. 444-9, doi:10.56495/jrip.v5i2.1072.