The Long List of Things that Can’t Be Copyrighted. In other words if you are in any doubt about referencing then this will show you why it is really important. Most things you find will have some type of copyright attached.
Timelines are a wonderful way to display information so people can better understand a chain of events in sequence. I thought this timeline of William Shakespeare was interesting because it showed the progression of his life and his work within the same information graphic. http://timelines.com/