I am with Celia. I don't use quotes in Ref Names, less typing that can cause problems is my reasoning. If you want 2 words, then push the words together with each capitalized and no spacing between them. I make sure my Census ref names have the year at the end of the name so I don't need to use quotes.
You need the quotes if you have a space in the ref name, special characters or start with a number, I think.