A book or article may have been written by multiple authors, rather than by just one. Because of this, your quotes will be mutually divergent: an article by one author will produce a very different quote than an article by twenty.
Also, the style of writing will depend on the number of authors and on whether you wish to mention the authors' name or names within the running text or after the quoted text.
1-2 authors
you should always acknowledge them. Put “and” between the two authors’ names in the main body of the text, or “&” after a text.
In the main body of the text:
After the quoted text: