Setyani, A. D. (2017). The Effect Of Using “Numbered Heads” Technique On Students’ Speaking Skill Viewed From Students’ Anxiety (A Quasi Experimental Research of 8th Grade of SMP Muhammadiyah 10 Surakarta in the Academic Years 2016/2017).

Setyani, Ardita Dwi. The Effect Of Using “Numbered Heads” Technique On Students’ Speaking Skill Viewed From Students’ Anxiety (A Quasi Experimental Research of 8th Grade of SMP Muhammadiyah 10 Surakarta in the Academic Years 2016/2017). 2017.

Setyani, Ardita Dwi. The Effect Of Using “Numbered Heads” Technique On Students’ Speaking Skill Viewed From Students’ Anxiety (A Quasi Experimental Research of 8th Grade of SMP Muhammadiyah 10 Surakarta in the Academic Years 2016/2017). 2017.