Start by searching PsycINFO to find the names of tests that have been used in the literature. Test names appear in both the Abstract field & the Tests & Measures field. The full instrument may be included in the full-text of the article. If this is the case, the test name is marked "Appended" in the Tests & Measures field. "Appended" means one of three things: that the full instrument is included as an appendix to the article, that items from the instrument are reproduced in a figure or table, or that items from the test are described in the methods section.
Mental Measurements Yearbook with Tests in Print
The library's guide for how to use Mental Measurements reviews of testing instruments.
Tutorial: https://vimeo.com/156620268
Full-text of Oxford Encyclopedias.
Over 1000 assorted reference sources.