Napa, P. A. (1992). Basic English Exercises/ Pieter A. Napa. Yogyakarta: Kanisius.
Lua i Stíl Chicago (17ú heag.)Napa, Pieter A. Basic English Exercises/ Pieter A. Napa. Yogyakarta: Kanisius, 1992.
Lua MLA (8ú heag.)Napa, Pieter A. Basic English Exercises/ Pieter A. Napa. Yogyakarta: Kanisius, 1992.
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