Source
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Field Description:
If the item was obtained from another feed, then the source feed's information is entered here. Source has one required attribute.  

Source:  
The title of the feed that this item came from  

Url:  
The URL to the RSS feed that the item came from. The proper syntax for the URL is to use the fully specified address that includes the scheme.  

Field Usage:
Including a Source with your feed is optional. However, if you enter information into the source field, then you must also include information in the URL field.  

Reference:
http://blogs.law.harvard.edu/tech/rss