Properly formatted citations serve several purposes:
Variations in citation style exist because different organizations prioritize different kinds of information. When you write / publish, you must generally use the appropriate style. Whatever you do … don't mix and match!
As explained in detail by the Purdue OWL, citation requires you to:
Repeat if necessary when you quote again from the source. Titles are used if you have two sources from the same author.
Wordsworth stated that Romantic poetry was marked by a “spontaneous overflow of powerful feelings” (263).
Romantic poetry is characterized by the “spontaneous overflow of powerful feelings” (Wordsworth 263).
Wordsworth extensively explored the role of emotion in the creative process (263).
List sources in alphabetical order.
Include the relevant publication information (this varies from book to webpage, etc.)
If you have already mastered another citation style because that's used in your major, I am OK with that. You should indicate it with the title of your bibliography or works cited page like this “Bibliography (Chicago Style)”. Please do not trust Easy Bib or other tools to get things right; you must check and proofread. Whatever you do, please don't mix and match four styles!