Gaya APA

Alexander, L. (2003). New Concept English Developing Skills: supplementary writen exerciess (Pertama, Cet.10). Yogyakarta: Kanisius.

Gaya MLA

Alexander, LG. "New Concept English Developing Skills: supplementary writen exerciess". Pertama, Cet.10 Yogyakarta: Kanisius, 2003. Text.