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Click on the database icons and type your topic into the search box.
To obtain a citation for an article you use, click on "Cite" under the Tools menu on the right-hand side of the page (when you are viewing the article). Scroll down to MLA, and copy the citation provided.
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From the article "invasive species", explore some other resources World Book offers. Click on links in the box "Related Information." There are two in-depth articles, as well as other recent articles about some specific species.