Villanueva, P. M. (2009). Discovering one world: (Book IV). Books Atbp.
Tohutoru Kātū Chicago (17th ed.)Villanueva, Perla M. Discovering One World: (Book IV). Mandaluyong City: Books Atbp, 2009.
Tohutoro MLA (9th ed.)Villanueva, Perla M. Discovering One World: (Book IV). Books Atbp, 2009.
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