Gaya APA

SINATRA, A, F. (2009). Optimizing task-based activitu to improve students speaking ability: A classroom action research at . : Universitas Sebelas Maret.

Gaya MLA

SINATRA, Arni, Ferra. "Optimizing task-based activitu to improve students speaking ability: A classroom action research at". : Universitas Sebelas Maret, 2009. Skripsi.