Cyhoeddwyd yn wreiddiol o dan y teitl = Originally published under title : 'Pam Fi Eto, Duw?' : Talybont, Ceredigion : Y Lolfa, 1998.
Rhys, Îfs, Spikey a'r criw. 2 by John Owen. ISBN 1860853986. Published by Uned Iaith Genedlaethol Cymru CBAC in 2000. Publication and catalogue information, links to buy online and reader comments.