Script credit posted in "Direct Currents" column in The Unexpected (DC, 1968 series) #148 (July 1973).
A reprint of this story was included in an uncorrected edition of Showcase Presents: Ghosts (DC, 2012 series) #1. However, when the corrected book was later released, it was deleted to accommodate insertion of a page that had been missing (from one of the other stories in this issue).