I need help from all of you sound design students and/or professionals here on tumblr! ;-)

I’m in desperate need for good literature/references/resources on the topic of sound desing and post-production in documentaries. I need for master’s thesis. While it is easy to find a lot about history of sound design in documentaries, it is VERY hard to find something good (and free :) ) about the actual process of sound design today!

sound design sound documentary documentaries post production