http://www.betternovelproject.com/blog/dialogue/
This little list is a good tool for going through your dialogue to make it sound more natural and less taxing on the reader. I found a lot of use for it in giving the reader more interpretation room by cutting all but he necessary dialogue tags. Tidy up your character's speaking parts. And read everything they say out loud!
7 Tips for Writing Realistic Dialogue
Realistic Dialogue
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