My nonfiction MS is 32,000 w of personal experience and knowledge in parenting. I realize that I am going to have to research and quote knowlegable experts as I proceed. What is the process in contacting the writer/publisher to gain permission to use a quote from their work in my MS? Is it a realitively simple common practice? What if they do not respond? Can you use a short (one sentence) quote and simply acknowlege in the reference section? Thanks for all the advise that I can get!