Sometimes writers are confused with how to craft parenthetical citations for non-print sources because of the absence of page numbers, but often, these sorts of entries do not require any sort of parenthetical citation at all. For non-print sources, include in the text the first item that appears in the Work Cited entry that corresponds to the citation (e.g. Name, Personal interview.):
Professor Smith thinks that Toni Morrison is the most important American author alive today (Smith, Personal interview).