Holzapfel has published with other Irish authors, including Oliver Snoddy and John Farrell, and his work has been anthologized in the Penguin Book of Irish Verse and Modern Irish Poets.
Rudi Carrell | Hans Rudi Erdt | Rudi Glöckner | Rudi Assauer | Rudi van Dantzig | Rudi Dutschke | Rudi Ball | Joe Rudi | Rudi Vis | Rudi-Sedlmayer-Halle | Rudi Scholtz | Rudi Protrudi | Rudi Martinus van Dijk | Rudi Hiti | Rudi Gunn | Rudi Garcia | Rudi Davies | Axel Rudi Pell |