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Cymdeithas Edward Llwyd (2009) Gwyfynod, Glöynnod Byw a Gweision Neidr [Moths, Butterflies and Dragonflies] (Cyfres Enwau Creaduriaid a Planhigion; 3)[1] (in Welsh), Llanrwst: Gwasg Carreg Gwalch, →ISBN