How do I cite a quotation from an eBook that does not have page numbers (e.g.from a Kindle)?
There are various guidelines on how eBooks could be cited.
For APA guidelines see: http://blog.apastyle.org/apastyle/2011/06/how-do-you-cite-an-e-book.html and http://blog.apastyle.org/apastyle/2009/09/how-do-i-cite-a-kindle.html The first link also has information on in-text citations for eBooks without page numbers. APA state that where there are no page numbers, you must name the major sections (chapter, section and paragraph number, abbreviating if titles are long, e.g. "As Gladwell states, ... (Gladwell, 2008, Chapter 1, Section 2, para. 5)."
For referencing in the Harvard style, see: http://libweb.anglia.ac.uk/referencing/harvard.htm.