This video (2 minutes) from NC State University Libraries explains citations, citation styles, and how they are used in academic writing.
“Citation: A (Very) Brief Introduction” by NCSU Libraries is licensed under CC BY-NC-SA 3.0.
This video (4 minutes) from California State University Dominguez Hills Library reviews basic citation principles for MLA 9th edition.
"Introduction to Citation Styles: MLA 9th ed." by CSUDH Library is licensed CC attribution reuse allowed.
This video (4 minutes) from California State University Dominguez Hills Library reviews basic citation principles for APA 7th edition.
"Introduction to Citation Styles: APA 7th ed." by Tessa Withorn is licensed CC by NC SA 2.0.