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Leena Abdullah, . (2006). Scientific inventions and their inventors. Petaling Jaya, Selangor: Penerbit Info Jaya.
Leena Abdullah, . 2006. Scientific inventions and their inventors. Petaling Jaya, Selangor: Penerbit Info Jaya.
Leena Abdullah, . Scientific inventions and their inventors. Petaling Jaya, Selangor: Penerbit Info Jaya. 2006.