Adding author credit to Radio blog entries?

Is there any way to change the item template for a Radio blog so that it includes a credit line for the author of an entry? In most Radio blogs there is no need for this because there is only one author, but in a multiauthor Radio blog (using the multiauthor tool, subscriving to RSS news feeds, and autoaggregating specified feeds onto the home page or into a category) there is such a need.
Is there a macro or other template tweak I can use to credit contributed entries automatically?