The APA author-date referencing style is the most commonly used across a range of schools.
This style is often used by Computer Science and Engineering students.
The Chicago B Author-Date Style is commonly used in the sciences & social sciences.
The New Zealand Law Style Guide is the primary referencing style for Law.
MHRA is commonly used in humanities disciplines. It uses footnotes, endnotes, & bibliographies.
The basics of ACS, AMA, Animal Behaviour & RSNZ referencing styles which are sometimes used in science research.