„David Letterman, WAGO Muncie Indiana”. reelradio.com. 01. 4. 1969. „Dave Letterman is heard in this segment edited from the 11PM–12 Midnight hour on April 1, 1969. WAGO was a carrier-current station at Pennsylvania State University. The voice of Lyla Whip is Letterman's former wife, Michelle, whom he calls at their apartment.”
