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SHIELDS, Tanya. (2018). Magnets and Forces . Inggris: Pearson Education Limited.

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SHIELDS, Tanya. Magnets and Forces. Inggris: Pearson Education Limited, 2018. Text.

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SHIELDS, Tanya. Magnets and Forces. Inggris: Pearson Education Limited, 2018. Text.

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SHIELDS, Tanya. Magnets and Forces. Inggris: Pearson Education Limited, 2018. Print.