James Quinn 
This Much is True [PDF ebook] 
14 Directors on Documentary Filmmaking

This Much Is True is a landmark volume about the art of directing documentaries, with contributions from some of the most eminent documentary filmmakers working today, including Nick Broomfield, Andrew Jarecki, Kim Longinotto, Kevin Macdonald, James Marsh and Albert Maysles.
Each chapter focuses on a particular element of the filmmaking process, and takes the form of an in-depth and highly personal conversation, presented in unvarnished documentary form. Taken as a whole, the book represents a uniquely candid and well-informed account of what it takes and what it means to make documentaries.