None of the information given below is intended to take precedence over any guidance provided by academic tutors / supervisors who may have a recommended style they want people to follow.

For PDFs: 

Citing a PDF document is more straightforward than for ePUBs because PDFs have fixed pagination. Whether you need to include information about the format and a URL will depend on your referencing style. Most referencing style guides offer information about citing digital materials. If you are using a style which does require you to list the format/platform in the full reference, we suggest referring to the eLD material as a ‘Restricted Access eBook’ or ‘Restricted Access Article’. For example:

Parker, E. (2022) Conquered: The Last Children of Anglo-Saxon England. [Restricted Access eBook] London: Bloomsbury Academic. Available at: https://cam.ldls.org.uk (Accessed: 12 December 2022).

For ePUBs:

The great majority of e-books received under legal deposit come in ePUB format. While this has advantages in terms of long-term preservation, ePUBs lack fixed page numbers, rendering traditional methods of citation impossible. The guide below provides a new method of citation specifically tailored for this circumstance. It is not intended to take precedence over any guidance provided by academic staff who may have a recommended style they want their students to follow. The new eLD player does include a ‘counting tool’ to assist in the creation of citations, and for the look-up of existing references. However, it is not reliable because it may count chapter headings and quotations at the head of a chapter as a single chapter in themselves, depending on how the book has been formatted.

Citing pages - electronic Legal Deposit - Oxford LibGuides at Oxford University