[Air-L] Citing from a Kindle

Dear all, I have started to download some academic books onto a Kindle account. It is ok for reading and for noting different thoughts as I read. However, since there is no page numbering, how do you cite the location of material in the books when you include it in your own work? What are the requirements for in-line cites and for the bibliography? Are the line numbers unique for Kindle and there is another set for the Apple iBooks, etc? What is a modern scholar to do? Rich L.