Gaya APA

RATNAWATI, A. (2010). Improving students english speaking ability through role play (a classroom action research conducted . : Universitas Sebelas Maret.

Gaya MLA

RATNAWATI, Aris. "Improving students english speaking ability through role play (a classroom action research conducted". : Universitas Sebelas Maret, 2010. Skripsi.