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Yong P. K., . (2009). Mathematics. Petaling Jaya, Selangor: Sasbadi.
Yong Ping Kiang, . 2009. Mathematics. Petaling Jaya, Selangor: Sasbadi.
Yong Ping Kiang, . Mathematics. Petaling Jaya, Selangor: Sasbadi. 2009.