Author Surname, First Initial. Second Initial. (year of publication). Title of dissertation or thesis (Doctoral dissertation or master’s thesis). Retrieved from Name of database. (Accession or Order No.)
For an unpublished dissertation or thesis:
Author Surname, First Initial. Second Initial. (year of creation). Title of dissertation or thesis (Unpublished doctoral dissertation or master’s thesis). Name of Institution, Location.
Thesis, from a commercial database
Nicometo, D. N. (2015). Increasing international education to develop culturally competent social workers: Social media recommendations for social work abroad program 501(c)3 (Order No. 1597712). Retrieved from ProQuest Dissertations & Theses Global. (1717577238).
Dissertation, from an institutional database
Andrea, H. (2014). Effective networked nonprofit organizations: Defining the behavior and creating an instrument for measurement (Doctoral dissertation). Retrieved from https://etd.ohiolink.edu/
Unpublished master’s thesis
Curry, J. (2016). A guide to educating single mothers about early gang intervention and prevention (Unpublished master’s thesis). Pacific Oaks College, Pasadena, CA.
See Ch 7 pp. 207-208 APA Manual for more examples and formatting rules