Wordpress plugins that display related articles can be found several, but the general plugins are displayed in text format, if the graphical display is more attractive. LinkWithin, a Wordpress plugin that allows you to print related post thumbnails at the bottom of posts.
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Introduce weren online a lot, such as Riku this article: http://riku.me/2009/05/05/linkwithin.html
I will not repeat their words, this article adds a description of LinkWithin's related FAQ, and in which case it is appropriate to use LinkWithin.