Gaya APA

PRANCISCA, S. (2010). Optimizing problem-based-learning to improve speaking competence on the eleventh year students of . : Pascasarjana UNS.

Gaya MLA

PRANCISCA, Stella. "Optimizing problem-based-learning to improve speaking competence on the eleventh year students of". : Pascasarjana UNS, 2010. Text.