Herbert, Frank (1965). "Appendix IV: The Almanak en-Ashraf (Selected Excerpts of the Noble Houses): Shaddam IV". Dune.
Herbert, Frank (1965). "In My Father's House (epigraph, Princess Irulan)". Dune. But we denied [Shaddam] a legal son ... My mother obeyed her Sister Superiors where the Lady Jessica disobeyed.