The American Psychological Association site offers tutorials and answers FAQs about writing papers, referencing sources, and citing sources.

• Double-spaced manuscript
• Serif fonts such as 12-Point Times Roman or 11-point Georgia
  (other san serif fonts are now permitted for online works such as 11-point Calibri, 11-point Arial, or 10-point Lucida Sans Unicode)
• 1-inch margins
• Running head on each page in capital letters
• Download a sample paper at:
  Student Paper (Annotated PDF)
  Professional Paper (Annotated PDF)
  Student Paper (Microsoft Word)
  Professional Paper (Microsoft Word)

Page number is required for a direct quote.

• (Smith, 2014, p. 23)

No page numbers for a direct quote? For in-text citation use para. # or Chapter #.

• (Green, 2002, para. 25) or (Green, 2002, Chapter 2)

No date?  Use (n.d.). in both the reference and in-text citation.

• (Jones, n.d.)

No author information for an article, chapter, or webpage?  Use article title, chapter title, webpage title, or first few words enclosed in quotation marks and italicize the book, report, or journal title when used in manuscript.

• ("Librarians Help Students," 2017) or In the Hanley Library Annual Report (2016)

See the Quick Answers - References page of the APA blog for more examples.