Gaya APA

NAPA, P, A. (1994). Vocabulary development skills / Pieter A.Napa (Cet.ke-2). Yogyakarta: Kanisius.

Gaya MLA

NAPA, Pieter, A.. "Vocabulary development skills / Pieter A.Napa". Cet.ke-2 Yogyakarta: Kanisius, 1994. Text.