Every article in Google Scholar includes a Cite option which will show you how to format your article in MLA, APA and Chicago Format.
Simply run a search and click on the quotation marks "" underneath the citation. A new window will open and you can copy and paste the citation into your document.
WorldCat
WorldCat is a free database which allows you to search for millions of books and other items.
Each book or other resource includes a Cite option which formats your citation into the following Format Styles: APA, Chicago, Harvard, MLA and Turabian.
These citations can then be cut and pasted into your document.