I recently finished reading a book by William Ury, "Getting Past No:  Negotiating in Difficult Situations".  This is not a new book (originally published in 1991), but the subject matter is timeless, and is applicable in all aspects of life.  Although my purpose when I purchased this book had nothing to do with ADHD, I was simultaneously amused and astonished at how much of the material that the author covers is exactly what I figured out in adressing issues with my ADHD spouse when we were having serious problems.