For UC Philosophy advice on writing a philosophy essay, when to add a reference, footnoting, compiling a reference list or bibliography, etc., see How to write a philosophy essay (Learn) . Unlike many disciplines, Philosophers do not insist on a single citation style or system. UC Philosophy suggests that you use one of:
The PHIL133 syllabus and course outline (2020) advises
For a quick and simple citation in one of the interdisciplinary styles, try