While polyamory remains controversial in some sectors, the Young Adult Library Services Association (YALSA) has included information regarding polyamory on their website. You can check out their short and well-done article on their reading recommendations at http://yalsa.ala.org/blog/2014/06/09/new-diversity-polyamory/
Dr. Sheff is an Educational Consultant and Expert Witness Serving Sexual and Gender Minorities.