No credits on story.
Letters from Babs Tuohy, Vincent M. Mansfield, H. M. Siegel, Benny Fontane, Phillip Jones, Richard "Grass" Green, Virginia Kaufman, Douglas Humphrey, and Rod Curran.
There is no box of credits on the splash page, but the frame is signed by Ogden Whitney.
To look like the famous mop-tops, Herbie wears a mop-top, with a prominent metal clip. Eibreh Rekcenpop is Herbie Popnecker, backwards.