Gaya APA

Mardiyah, N. (2007). The Effect of Applying Role Playing in Asking for Giving Direction on the Students' Achievement in Speaking . : Universitas Muhammadiyah Sumatera Utara.

Gaya MLA

Mardiyah, Nurlaila. "The Effect of Applying Role Playing in Asking for Giving Direction on the Students' Achievement in Speaking". : Universitas Muhammadiyah Sumatera Utara, 2007. .