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Encyclopædia Britannica Encyclopædia Iranica Encyclopedia of Life Encyclopédie Encyclopedia Americana Encyclopædia Britannica Eleventh Edition Encyclia Encyclopaedia Hồi giáo Encyclia randii Encyclia tampensisTài liệu tham khảo
WikiPedia: Encyclopedia_of_Life http://www.alexa.com/siteinfo/eol.org http://isni-url.oclc.nl/isni/0000000404997215 http://eol.org http://www.eol.org/info/press_releases https://www.youtube.com/watch?v=6NwfGA4cxJQ https://eol.org/