Finding the full text of tests, instruments, and measures can be very tricky because most well-known tests are only available commercially (i.e.must be purchased). Commercially available tests are often referred to as "published" tests.
The APA has a guide for Finding Information About Psychological Tests that provides an extensive overview of this topic.
You can search in these article databases for information about or clinical uses of specific tests and measures. You can also try key word searches for your topic and the terms such as measurements, measures, tests or testing.