Gaya APA

NAPA, P, A. (2003). BASIC ENGLISH EXERCISES / Pieter A. Napa (Cet.ke-7). Yogyakarta: Kanisius.

Gaya MLA

NAPA, Pieter, A.. "BASIC ENGLISH EXERCISES / Pieter A. Napa". Cet.ke-7 Yogyakarta: Kanisius, 2003. Text.