Changes

* [http://www.fivebladesbrewing.com/year-sour-mash/ ''Year of the Sour Mash'' by Derek Spring]. This series of articles were written for his NHC 2015 presentation.]* [http://homebrewingfun.blogspot.com/2010/10/sour-mash-how-to.html Sour Mash How-To, by Adam Kielich (Brain Sparging on Brewing blog).]* [http://byo.com/kegging/item/1691-sour-mashing-techniques Sour Mashing: Techniques, BYO, by Dave Green. October 2008.]* [https://byo.com/videos/item/889-how-to-make-a-sour-mash-techniques How to Make a Sour Mash: Techniques, BYO, September 2000.]