What is the proper font and font size to use?
If font size and style are not specified by the organization for which you are writing (e.g., publisher, university), the suggested font is 12-point Times New Roman.
For more details see the APA Style website:
All information and page number references are based on the 6th edition of the Publication Manual of the American Psychological Association (2009/10).
Need a copy of the Publication Manual? Click here for details. See Also: APA Style Guide to Electronic References, Sixth Edition