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Peter Hayman, Rob Hume (2004) Iolo Williams, transl., Llyfr Adar Iolo Williams: Cymru ac Ewrop (in Welsh), Llanrwst: Gwasg Carreg Gwalch, →ISBN, page {{{1}}}
Peter Hayman, Rob Hume (2004) Iolo Williams, transl., Llyfr Adar Iolo Williams: Cymru ac Ewrop (in Welsh), Llanrwst: Gwasg Carreg Gwalch, →ISBN, page {{{1}}}