The required elements of a reference are:
Roberts, D. (2002) Shattered Bonds: The color of child welfare. [Kindle edition] New York: Basic Books.
If you include a quotation from an ebook, without page numbers, use the section heading or chapter heading as a guide to locating your quotation. For the example above:
"Black families are being systematically demolished" by the U.S. child welfare system (Roberts, 2002: Kindle location 44).