Follow your professor's guidelines for the format of your title page. If there are no guidelines given, here are the guidelines provided in the 7th edition of the APA Publication Manual (section 2.3).
Running Head is only required for a paper that is going to be published. Running heads are not required for student papers unless the instructor or institution requires it. (Consult your syllabus.) The only header required for a student paper is the page number.
The reference list should be on a separate page following the text of the paper.