Henri Helynt a'r ysbryd /
Simon, Francesca.
Lewis, Siân,1945-
Ross, Tony.
Aberystwyth : Y Ganolfan Astudiaethau Addysg,
2007.
Arg. Saesneg gwreiddiol = Original English ed. : London : Orion Publishing, 1999.
Addasiad Cymraeg gan = Welsh adaptation by : Siân Lewis.
Horrid Henry (Fictitious character)
Children's stories, Welsh.
Haunted houses