Theses & dissertations can be found in various places; as such, there are a few ways to cite them.
General guidelines:
-Italicize the title of the doctoral dissertation or master's thesis
-Identify the work as a doctoral dissertation or master's thesis in parenthesis after the title
-If the work was found in a database, identify the database and provide the accession or order number in parenthesis at the end of the reference.
For dissertations & theses found from an institutional database (such as an institutional repository):
For dissertations & theses found online (not in an IR):