Seren y dyfodol /
Jefferies, Cindy.
Huws, Emily.
Llanrwst : Gwasg Carreg Gwalch,
2007.
Argraffiad Saesneg gwreiddiol = Original English edition : London : Usborne Publishing, 2005.
Addasiad Cymraeg gan = Welsh adaptation by: Emily Huws.
Singers