———. The Rise of the Celts. London: Kegan Paul, Trench and Trubner (1934). New edition, London: Constable (1987).

Humphreys, Emyr. The Taliesin Tradition. Black Raven Press (1983).

Hunt, Robert. Cornish Customs and Superstitions. Penryn, Cornwall: Tor Mark Press (n.d.).

———. Cornish Folk-Lore. Penryn, Cornwall: Tor Mark Press (1988).

———. Cornish Legends. Penryn, Cornwall: Tor Mark Press (1990).

Hyde, Douglas. A Literary History of Ireland. T. Fisher Unwin (1899).

Irish Text Society. Publications. Dublin: Irish Text Society (1899– ).

Jackson, Kenneth H. A Celtic Miscellany. London: Routledge & Kegan Paul (1951).

———. The International Popular Tale and Early Welsh Tradition. Cardiff: University of Wales Press (1961).

———. Language and History in Early Britain. Edinburgh: Edinburgh University Press (1953).

Jarman, A. O. H., ed. and tr. Y Gododdin: Britain’s Oldest Heroic Poem. Dyfed: The Welsh Classics (1988).

———, and G. R. Jarman. A History of Welsh Literature (vol. 1). Llandybie, Wales: Christopher Davies (1974).

Jones, Gwyn, and Thomas Jones. The Mabinogion. London: Everyman, Dent (1949).

Jones, T. G. Welsh Folk-Lore and Folk Custom. London: Methuen (1930).

Joyce, P. W. Old Celtic Romances. London: Longman (1879).

Kavangh, Peter. Irish Mythology (limited edition of 100). New York (1958–1959).

Kinsella, Thomas. The Táin. Oxford: Oxford University Press (1970).

Lacy, Norris J., ed. The Arthurian Encyclopaedia. Woodbridge, Suffolk: Boydell (1988).

Laing, Lloyd, and Jennifer Laing. Celtic Britain and Ireland: The Myth of the Dark Ages. Dublin: Irish Academic Press (1990).

La Villemarqué, Hersart de. La légende celtique et la poésie des cloitres en Irlande, en Cambrie et en Bretagne. Breizh: Editions Slatkine (1984).

Loffler, C. M. The Voyage to the Otherworld Island in Early Irish Literature. Salzburg, Germany: Institut für Anglistik und Amerikanistik (1983).

Lofmark, C. Bards and Heroes. Llanerch, Wales: Llanerch Enterprises (1898).