Q. How do I cite a thesis or dissertation using APA style?

Doctoral dissertations and Master's theses can be found in databases, university/institution archives, and on personal websites. 

Here is an example of a typical print thesis found at Western Washington University:

Omri, K. E. (2005).  Risk perception among former Hanford workers. (Unpublished master's thesis). Western  
       Washington University, Bellingham, WA.

Online:

Schierl, Z. P. (2014). Effectiveness of time-lapse videos as a method to teach rates of surface geological
      processes. (Master's thesis, Western Washington University). Retrieved from: http://cedar.wwu.edu/wwuet/381