Gaya APA
SJAH, D., ENONG, A.
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PRACTICAL GUIDE TO BUSINESS CORRESPONDENCE
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JAKARTA:
CV.SIMPLEX.
Gaya MLA
SJAH, DJALINUS., ENONG, AZMAR.
"PRACTICAL GUIDE TO BUSINESS CORRESPONDENCE".
JAKARTA:
CV.SIMPLEX,
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Prodi D3 Kesekretariatan.