You can do this with a custom report. Publish, Person Reports, Custom Report.
Under Individuals to Include select Selected Individuals and Filter In. In the window titled Filter Individuals by Criteria select the Other option. In the Search Where box select Source Information. Change the middle box from Exists to Contains. For Value inter the value you want to search on.
Following this procedure I was able to lsit every on who had a source with Colestown in the source tirle.