NAPA, P. A. (1994). Basic english exercise. Kanisius.
Lua i Stíl Chicago (17ú heag.)NAPA, Pieter A. Basic English Exercise. Yogyakarta: Kanisius, 1994.
Lua MLA (9ú heag.)NAPA, Pieter A. Basic English Exercise. Kanisius, 1994.
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