When you find a test that looks good for you to use, you'll have to see if you can get a copy. Many tests are only provided by the test publisher and will require that you purchase the test.
However, some tests and measures are published in either the journal literature or in collected handbooks, guides,or anthologies.
Test that is published in an article:
Test that is published in a book:
You can also try searching in the "Worldwide Libraries" of the library's catalog for the test title to see if a copy is anthologized or included in a handbook or compilation.
After you find the citation for your article, you can search our journals by title to see if Penfield owns the journal that you need.
Use Psyctests to find full texts of tests and measures. This database from APA has full text of over 7,000 measures.