Gaya APA

DJULIA, E. et al (2011). Active learning in language study and science. Transforming teacher practice in north Sumatra's . USA: University of Pittsburgh.

Gaya MLA

DJULIA, Ely. et al. "Active learning in language study and science. Transforming teacher practice in north Sumatra's ". USA: University of Pittsburgh, 2011. Artikel.