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Cheah H., . (2004). Parts of plants & photosynthesis. Petaling Jaya, Selangor: Penerbit Penapro.
Cheah Helena, . 2004. Parts of plants & photosynthesis. Petaling Jaya, Selangor: Penerbit Penapro.
Cheah Helena, . Parts of plants & photosynthesis. Petaling Jaya, Selangor: Penerbit Penapro. 2004.