According to APA Style, there are 4 key parts of a reference:
Author: Who is responsible for this work? Could be one or more individuals, or it could be a group or organization (a hospital, government agency, or business).
Date:When was this work published? Use "n.d." if publication date or last updated date is unavailable.
Title:What is this work called? Note the difference between "stand alone" works (book, journal, feature film, TV series, artwork, podcast or YouTube video) and works that "are part of a greater whole" (chapter in a book, article from a journal, song from an album, TV episode, or podcast episode).
Source: Where can I retrieve this work? (depends on the document type).