Henri Helynt a'r wrach warchod /
Simon, Francesca.
Lewis, Siân,1945-
Ross, Tony.
Aberystwyth : Canolfan Astudiaethau Addysg,
2007.
Arg. Saesneg gwreiddiol = Original English ed.: Orion Children's Books, 2002.
Horrid Henry (Fictitious character)
Disorderly conduct