Why use audio or video sources?

These sources

• can be valid sources for research!!
• give you a visual and emotional understanding of your topic
• allow you to hear important talks or lectures at your own convenience 
• can provide authentic, first-hand accounts of events from participants or witnesses in the film 
• are great for presentations you must give in front of a class - keep your audience interested and engaged!
• need to be evaluated to determine if they are of good quality

Is it a "good" video for your research?  Evaluate it!