What quotations you use is equally as important to how you use them. I have created some guidelines below to aid you in your use of quotations. However you must use discretion and critical thinking to choose what is appropriate. Some criteria to use when evaluating a document will help. Be sure to have a focus when you sit down to research.
Relevance also has to do with audience.
Using statistics for an audience who prefers anecdotal information is problematic. If you are researching the gender issue in online computer use, don't use data that is over six months old. There are survey sites that are updated monthly, so using outdated material will skew your statistics. When using the sources from other media, including the library, let your topic inform currency. Check out the author.