Most of the Chicago style rules for referencing print books apply to referencing eBooks e.g. how to reference multiple authors, different editions, an edited book etc. Click on "Books" on the tab above for further details.
Many eBooks now have page numbers which correlate with their print alternatives. If an eBook has page numbers then you provide those page numbers in your footnote, the same as you would for a print book. If an eBook does not have page numbers or does not have constant page numbers (e.g. in an eReader where the size of font or screen orientation can change the number of pages) then you can include a section title or a chapter or other number such as a paragraph number. If you are using a direct quote or very close paraphrasing be as exact as possible.
There are some specific differences with referencing an eBook. Below is specific information on how to reference:
NB: If a book is available as both a print book and eBook you should follow the rule "cite what you used" and cite whatever version of the book you accessed for your assignment.
Footnote
1st citation
First name Surname, Title of the book: Subtitle of the book (City of publication: Publisher, Year), URL page number(s).
Albert Eichhorn and Hugo Gressman, The Lord's Supper in the New Testament (Atlanta: Society of Biblical Literature, 2007), http://search.ebscohost.com/login.aspx?direct=true&scope=site&db=nlebk&db=nlabk&AN=217209 60.
Subsequent citations
Surname, Shortened title of book, page number(s).
Eichhorn and Gressman, The Lord's Supper, 55.
Bibliography
Surname, First name. Title of the book: Subtitle of the book. City of publication: Publisher, Year. URL
Eichhorn, Albert and Hugo Gressman, The Lord's Supper in the New Testament. Atlanta: Society of Biblical Literature, 2007. http://search.ebscohost.com/login.aspx?direct=true&scope=site&db=nlebk&db=nlabk&AN=217209
Footnote
1st citation
First name Surname, Title of the book: Subtitle of the book (City of publication: Publisher, Year), Kindle edition, page number(s).
Alister McGrath, Theology: The Basics (Malden: Wiley-Blackwell, 2011) Kindle edition, 176.
Subsequent citations
Surname, Shortened title of book, page number(s).
McGrath, Theology, 233.
Bibliography
Surname, First name. Title of the book: Subtitle of the book. City of publication: Publisher, Year. Kindle edition.
McGrath, Alister. Theology: The Basics. Malden: Wiley-Blackwell, 2011. Kindle edition.