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Gaya APA

Riyanto, S. (2010). Developing Vocabulary Skills Book 1 . Yogyakarta: Yogyakarta: Pustaka Pelajar.

Gaya MLA

Riyanto, Slamet. "Developing Vocabulary Skills Book 1". Yogyakarta: Yogyakarta: Pustaka Pelajar, 2010. Text.