Argraffiad Saesneg gwreiddiol = Original English edition : Shepton Mallet : Treehouse, 2002.
Llyfr bordyn = Board book.
Tap, tap! pwy sy 'na? = Tap, tap! who's there by Karen Jones. ISBN 1855966018. Published by Dref Wen in 2003. Publication and catalogue information, links to buy online and reader comments.