| Issuu, Inc., US. |
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| Scribd |
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| CiteFactor |
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| Google Scholar |
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| ResearchGate |
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| GIF |
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| Directory of Abstract Indexing for Journals |
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| SIS |
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| Open J-Gate |
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| Academia.edu |
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| ResearchBible |
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| MENDELEY |
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| IIJIF |
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| OPEN LIBRARY |
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| InfoBase Index |
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| AcademicKeys |
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| Eurasian Scientific Journal Index |
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| citeUlike |
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| International Institute of Organized Research |
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| Information Matrix for the Analysis of Journals, |
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| Cosmos Foundation (Germany) |
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| Open Academic Journals Index |
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