Commercially published test
These are standardized tests that are available through commercial vendors and must be purchased. Users need special qualifications to administer them.

Unpublished test
Can be found in selected books, as an appendix in journal articles, and in the appendix of dissertations.

FAQ: Finding Information About Psychological Tests
from the American Psychological Association (APA)

Provides guidance in using available resources to find psychological tests.

• Published Psychological Tests
• Unpublished Psychological Tests and Measures
• Additional Information on the Proper Use of Tests