* [http://plainlanguage.com/newreadability.html PlainLanguage.com] — All About Readability
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* [http://www.impact-information.com/impactinfo/readability02.pdf The Principles of Readability by William H. DuBay] — a brief introduction to readability research
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* [http://www.gnu.org/software/diction/ Style and Diction] — free software by the [[GNU Project]] that calculates the Flesch–Kincaid readability score
