According to Healey (2005) ... OR
Research indicates ... (Healey, 2005)
Healey, D. (2005). Attention deficit/hyperactivity disorder and creativity: An investigation into their relationship. Unpublished doctoral dissertation, University of Canterbury, Christchurch, New Zealand.
- For PhD use Unpublished doctoral dissertation after the title.
- Use Unpublished master's thesis for master's degree.