Zotero: The Tri-College Libraries recommend Zotero, a free online app that can format your bibliography, keep your citations organized, and even save your articles in the cloud so you can access them later from the library, home, or a cafe.
EndNote Web: The Tri-Colleges provide free access to EndNote Web.
Any librarian will be happy to give your a tour or a few pointers of the software.
Author-Date format uses parenthetical in-text citations, and a reference list at the end of the work. This format is used by scholars in the social sciences and sciences. Here are examples for a book and a journal article:
(Smith 2016, 315–160)
(Satterfield 2016, 170)
Satterfield, Susan. 2016. “Livy and the Pax Deum.” Classical Philology 111,
no. 2 (April): 165–76.
Smith, Zadie. 2016. Swing Time. New York: Penguin Press.
For more examples, see the full Author-Date style guide.