Harvard referencing is one of the most widely encountered author-date approaches to academic source documentation.
Students may encounter Harvard referencing in:
One important fact should be understood immediately:
Harvard referencing is not a single universally controlled style in the same way that some other named academic styles are tied to a particular official manual.
Different universities, departments, publishers, and institutions can use different Harvard variants.
As a result, a student should never assume that a Harvard citation found online automatically matches their institution’s requirements.
The underlying principle is generally an author-date system:
Author + Year