Type "References" at the top of the page, select it and click the "Center Justify" button under the "Paragraph" section.
Enter all of your sources according to the APA guidelines.
Select all of your references.
Click the arrow in the lower corner of the "Paragraph" section to open the dialog box.
Click on the "Special" drop-down under "Indentation" and select "Hanging." This will indent any successive lines of a reference that carry past the first line.