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https://www.nesabamedia.com/pengertian-data/
http://kuliah.dinus.ac.id/edi-nur/sb1-7.html
http://www.pengertianahli.com/2013/11/pengertian-data-dan-jenis-data.html
https://navelmangelep.wordpress.com/2011/12/30/variabel-variabel-dalam-penelitian/
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