Gaya APA

al.], W, S, [. et al (2005). English in Context: Developing Competencies in English for Grade X (Edisi Pertama). Jakarta: Erlangga.

Gaya MLA

al.], Wachyu, Sundayanal, [et. et al. "English in Context: Developing Competencies in English for Grade X". Edisi Pertama Jakarta: Erlangga, 2005. Text.