Published tests: Published tests & measurements should be purchased directly from the publisher. Indexes of publishers can be found in the Mental Measurements Yearbook, Tests in Print, Test Critiques, and other sources. Most test publishers can be found on the web.
Unpublished tests If you are having a hard time finding a test, it is probably unpublished. An unpublished test can usually be obtained by contacting the researcher who created it. If you plan to use an unpublished test in your own research you should first get permission from the author of the test.
NOTE: The new library database PsycTESTS is now the best way to search for complete copies of psychological tests and measurements. PsycTESTS was created by the American Psychological Association to be a complete reference source for tests and measurements used in research. If PsycTESTS does not contain the test you need try the two part strategy below.
A Quick Two-Part Strategy for Locating Copies of Unpublished Tests
Complete copies of many unpublished tests can be found in journal articles and in reference books known as test compilations.
See the APA FAQ on psychological tests for more tips on obtaining both published and unpublished Tests & Measurements.