Arg. Saesneg gwreiddiol = Original English ed.: London: William Heinemann, 1997.
Addasiad Cymraeg gan = Welsh adaptation by: Luned Whelan.
Teitl clawr = Cover title.
Llyfr bwrdd = Board book.
Pwff, pwff, dyma Tomos by Christopher Awdry. ISBN 0852842163. Published by Hughes a'i Fab in 1997. Publication and catalogue information, links to buy online and reader comments.