You will need to show that the assessment (test/measure/scale/whatever) is valid, so it actually measures what it's trying to measure. You can search for this in a psychology database by searching for the name of the assessment AND valid*
You can also check for this in the Mental Measurements Yearbook. This is a print book set in the Reference section of the Trustee Library (REF BF176 .B87). You can check which volume might have your assessment at this website: https://buros.org/tests-reviewed-mental-measurements-yearbook-series . Tip: press CRTL-F and search the name of your assessment to find it on the page.
Freebie for anyone using Social Readjustment Rating Scale:
The official name of the test is the Social Readjustment Rating Scale or the Holmes-Rahe Stress Inventory. Neither of these names appear in the MMY so you will have to use the databases to seek validation studies in the databases. When looking for validation it is easier to find information using Holmes Rahe than SRRS.