Mental Measurements Yearbook (MMY), produced by the Buros Institute since 1938, contains information about and reviews of English-language standardized tests covering educational skills, personality, vocational aptitude, psychology, and related areas as included in the printed Mental Measurements Yearbooks.
Tests are included in MMY if they are new and revised since the previous yearbook or are widely generated and have more than 20 references in literature. Each entry provides descriptive information, such as the test name, intended population, publication dates, forms and prices, test author, and publisher. It also contains additional information on the extent to which reliability, validity, norming data, scoring and reporting services, and foreign language versions are available. Most entries include one or more reviews of the test and testing materials (e.g., manuals) by qualified psychologists.
Available in print: RBD 2nd Floor - Reference Collection BF 176. M46 (Yearbooks 1-16, 1938-2005)
1) Finding test reviews.
2) Finding information on an instruments' validity and reliability.
If you know the title of the test you are looking for, the best first step is to check the Internet. Sometimes you can find the publisher of the test through this method and determine if they're selling the test online. And there's always the off-chance that the entire test will be on the Internet for free. It's worth trying.