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Google Scholar can be found on the web at http://scholar.google.com.
To do that, look up the article or book you are interested in finding citations to.
You can do a basic search or try the more precise Advanced Scholar Search.
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Among the results that come up, will probably be one or more for the cited source you're interested in.
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In the lower left corner of each entry will be the indication *"Cited by \[number\]".* Wiki Markup
In the lower left corner of each entry will be the indication "Cited by [number]".
Clicking on the Cited by link brings up the list.
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