It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
The author-date reference system (sometimes called Harvard) we use at ACAP (Criminology & Policing) comes from the Style Manual for authors, editors and printers (6th edn, 2006) published by John Wiley and Sons. It is called author-date because the in-text citation usually contains the author's name and date of publication.