eBooks are cited in the same manner as regular books with the addition of an assessed date and link.
Example:
4. Guyatt G, Rennie D, Meade MO, Cook DJ. Users' Guides to the Medical Literature: A Manual for Evidence-Based Clinical Practice. 3rd ed. McGraw-Hill Education; 2015. Accessed August 15, 2016. https://jamaevidence.mhmedical.com/book.aspx?bookID=847
