The following questions might help you determine how far removed from the original event a source is:
- How does the author/creator know these details (names, dates, times)? Was the author present at the event or soon on the scene?
- Is this an original work based on first-hand experience?
- Where does the information come from – personal experience, eyewitness accounts, or reports written by others?
- Is this work based on a single piece of evidence or have many sources been taken into account?