Afrofuturism: The World of Black Sci Fi & Fantasy Culture by Ytasha L. Womack (Oct 2013) www.iafrofuturism.com
BlackGirlNerds.com has created a masterpost of books written by and/or featuring Black people in speculative fiction. They list the books and authors in a beautiful and loose kind of categorization. Some of the authors included are Nalo Hopkinson, Samuel L. Delany, Steven Barnes, and Ytasha Womack. Link above!