Harri Parri - ci gwaetha'r byd
By: gan Sheila Lavelle ; darluniwyd gan John Ireland ; [addaswyd y llyfr hwm i'r Gymraeg gan Eleri Rogers].
Contributors: Ireland, John.; Rogers, Eleri.; National Language Unit of Wales.
Series: Project Llyfrau Longman
Publisher: Uned Iaith Genedlaethol Cymru CBAC
Published: 1996
Place of publication: Caerdydd
Language: wel
Number of pages: 24
Subjects: Dogs -- Juvenile fiction.; Welsh language -- Readers.
Genres: Juvenile fiction.; Readers.
Work titles: Webster the world's worst dog.
Notes: Argraffiad Saesneg gwreiddiol = Original English edition: Harlow : Longman Group, 1994.

Addasiad Cymraeg gan = Welsh adaptation by: Eleri Rogers.

Addasiad Cymraeg o = Welsh adaptation of: Webster the world's worst dog.