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Len,Evelyn. (1989). Secondary 1 vocabulary guide & practice/Evelyn Len . Jakarta: Binarupa Aksara.

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Len,Evelyn. Secondary 1 vocabulary guide & practice/Evelyn Len. Jakarta: Binarupa Aksara, 1989. Text.

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Len,Evelyn. Secondary 1 vocabulary guide & practice/Evelyn Len. Jakarta: Binarupa Aksara, 1989. Text.

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Len,Evelyn. Secondary 1 vocabulary guide & practice/Evelyn Len. Jakarta: Binarupa Aksara, 1989. Print.