Citation

In a citation, it is the author and year that is required (NB direct quotes also require a page number).

so:

If included as part of the sentence, then: Author (year of publication).
At the end of the sentence that summarises the text taken, it's inside parentheses: (Author, year of publication).

Very Important: Initials/first name(s) of the author DO NOT appear in the citation.

In-text example:

Holland (2018) discusses mood stabilising medications …

A patient's mood can be supported with medications (Holland, 2018).