أفضل ثماني محركات بحث موثوقة ومجانية للبحوث العلمية والأكاديمية
1. Google Scholar
http://scholar.google.com/
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2. CiteSeerx
http://citeseerx.ist.psu.edu
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3. GetCITED
http://www.getcited.org/
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4. Microsoft Academic Research
http://academic.research.microsoft.com/
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5. Bioline International
http://www.bioline.org.br/
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6. Directory of Open Access Journals
http://www.doaj.org/
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7. PLOS ONE
http://www.plosone.org/
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8. BioOne
http://www.bioone.org/
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