The reference list entry for a whole e-book should include the same elements as a print book: author/date/title [subtitle] and publisher. You don’t need to include the format, platform or device (e.g. Kindle).
Include a DOI if there is one. Do not include a URL or database information for works from academic research databases.
Include a URL for ebooks from other websites if there is no DOI.
Ebook from a university database
Nicholson, R. (2019). Ladies and lords: a history of women's cricket in Britain. Peter Lang. https://doi.org/10.3726/b13283
Author(s)’ surname, comma, followed by their initials with a full stop after each initial (and a comma if more than one author)
Year of publication in round brackets followed by a full stop
Title (and subtitle if applicable) of book in italics, followed by a full stop
DOI (if there is one)
Ebook with a nondatabase URL (i.e. freely available online)
(Grolemund & Wickham, 2017)
Grolemund and Wickham (2017)
Grolemund, H., & Wickham, H. (2017). R for data science. O’Reily. https://r4ds.had.co.nz/
Author Surname, Initial(s)., & Author surname, Initial(s). (Year). Book title: Subtitle. Publisher. URL