This is actually a complicated question.  

The short answer is no, everything in the library is not a good source for every research question.

The long answer is, it depends.  It depends on -

  • Your research question.
  • Your goals as an author.  
  • The expecations of your audience.

A source that is perfectly appropriate to answer one research question may be very problematic in another context.  Academic libraries have big, diverse collections.

Let's look at one example.  This is a book in the Valley Library.

A green and black book on a library shelf with the title Gregg Typing 191 Series

Most people would agree that if you are researching office efficiency, and your goal is to find the most efficient equipment for your office, this would be a terrible source to use.  

If, however, you were looking at something else -- maybe you are making a short film set in the 1950's and you want to check for details, or you could be analyzing fonts used in mid-century graphic design -- this could be the perfect source for you.

The takeaway here is that you have to evaluate the sources you find in the library, just as you would evaluate any other source.