Author-Date style is a more concise format. It is usually used by scholars in the sciences and social sciences.
♦Provide brief parenthetical citations within the paper (usually the author's last name and publication date).
♦List full citations at the end of the work in a "Reference List."
Reference List Entries (in alphabetical order)
Grazer, Brian, and Charles Fishman. 2015. A Curious Mind: The Secret to a Bigger Life. New York: Simon & Schuster.
Smith, Zadie. 2016. Swing Time. New York: Penguin Press.
In-text Citations
(Grazer and Fishman 2015, 12)
(Smith 2016, 315–160)
For more examples, see 15.40–45 in The Chicago Manual of Style