Jo Knell

Ble Mae'r Gair? Posau Geiriau i Ddysgwyr  Jo Knell Paperback. Gomer Press, 2015-08-13 ISBN 9781785620317     WJEC GCSE Welsh (2nd Language): Revision Guide (Collins GCSE Essentials)  Jo Knell Paperback. Letts Educational, 2013-03-25 ISBN 9781844196883     Caerdydd (Cyfres Brechdan Inc)  Jo Knell Paperback. Gomer Press, 2007-03-01 ISBN 9781843236191