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.