If you want a specific research instrument...
Type the title and author into Google
You are responsible for contacting the author or publisher of the research instrument to ensure that you have permission to use the research instrument (and to reproduce it if you plan to share a copy with others).
The National Center for Health Statistics (NCHS) surveys have many questions available online for you to use or adapt for your population!
Some research instruments are only be available for purchase from a publisher.
Some research instruments are made available by the authors upon request, or shared in a journal article or book.
If you're looking for a research instrument on your topic, start by searching one of these sources.
Here are some the books in our collection that contain research instruments.
Google Books offers previews of some books, which can be helpful if you're trying to decide whether to walk to the library and check out the print.