Teaching UGC NET Mock Test Series 2025 (Paper 1 & 2) Library Science Information Sources & Services Reference Sources & Types

निम्नलिखित में से कौन सा ओपन-एक्सेस डेटाबेस नहीं है?

1
डीओएजे, DOAJ 
2
एरिक, ERIC
3
विकिपीडिया
4
एमराल्ड, Emerald 
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