Gaya APA

ALEXANDER, L. (). New Concept English Developing Skills : Supplementary Written Exercisses (Cet. 1). Yogyakarta: Kanisius.

Gaya MLA

ALEXANDER, L.G. "New Concept English Developing Skills : Supplementary Written Exercisses". Cet. 1 Yogyakarta: Kanisius, . .