You reference chapters in edited books in the same way regardless of format.  Examples are given for print and ebooks just to illustrate this.  Where an ebook doesn't give page numbers, but the chapter has a doi (digital object identifier) this can be used in place of the page numbers.

The reference list entry for a chapter in an edited book should contain:

• In-text reference number
• Author information for the chapter, in the format of Initial(s). Surname with all authors of the chapter listed in the order they are given, followed by in
• Title of the book (italicised)
• Followed by ed. Initial(s). Surname of the editor(s) 
• Publisher
• Place of Publication
• Year
• The abbreviation ch. for chapter, and the chapter number
• Page range.

All components are followed by a comma, except for the page range which is followed by a full-stop.

(3) Initial. Surname, in Book title, ed. Initial. Surname, Publisher, Place, Year, ch. no, pp. x-xx.