When it comes to formatting physical and digital copies of books for reference list entries, the process is generally the same, with the exception for eBooks being they include the DOI or URL information.
The general format for books and eBooks should be as follows:
Author, A. A., Author, B. B., & Author, C. C. (Year). Title of work: Capital letter also for subtitle. Publisher Name.
Things to note:
For additional examples of formatting books/eBooks, please consult 10.2 of the Publication Manual or the APA Style website.
Additionally, if citing a chapter in an authored book, please create a reference for the whole book and provide the chapter number as part of the in-text citation only; for more examples of this, please review section 8.13 of the Publication Manual.
In-text: (Festić, 2012)
Reference List: Festić, F. (2012). Gender and trauma: Interdisciplinary dialogues. Cambridge Scholars Publishing.
Refer to section 9.30 of the Publication Manual on the inclusion of database information in your references.
In-text: (American Psychiatric Association, 2022)
Reference list: American Psychiatric Association. (2022). Diagnostic and statistical manual of mental disorders (5th ed., text rev.). https://doi-org.paloaltou.idm.oclc.org/10.1176/appi.books.9780890425787
For additional examples on how to appropriately cite other editions and entries in the DSM, please take a look at the APA Style website.
In-text: (Zaoui, 2018)
Reference list: Zaoui, S. (2018). Humanizing sex trafficking and commercial sexual exploitation through a trauma-informed, person-in-environment lens. In L. Finley (Ed.), Gender, sexuality, and peace education: Issues and perspectives in higher education (pp. 58-62). Information Age Publishing.