Humairoh, S., V. Roza, R. Reflinda, and M. Melani. “The Implementation of Numbered Heads Together (NHT) Technique in Teaching Speaking Skill at IX Grade of SMPN 7 Bukitinggi”. Continuous Education: Journal of Science and Research, vol. 5, no. 2, June 2024, pp. 119-30, doi:10.51178/ce.v5i2.1935.