If you cite or quote your previous work, treat yourself as the author and your own previous course work as an unpublished paper, as shown in the APA publication manual. For example, if Marie Briggs wanted to cite a paper she wrote at Walden in 2012, her in-text citation might look like this: Briggs (2012) asserted that previous literature on the psychology of tightrope walkers was faulty in that it "presumed that risk-taking behaviors align neatly with certain personality traits or disorders" (p. 4). And in the reference list: Briggs, M. (2012). An analysis of personality theory. manuscript, Walden University. If your original work contained citations from other sources, you will need to include those same citations in the new work as well, per APA.
• Avoiding Plagiarism