(This list is not a Bibliography.)
| BRAND | Rev. J. Brand, Observations on the Popular Antiquities of Great Britain. 3 vols. 1870. | 
| BLANCHET | A. Blanchet, Traité des monnaies gauloises. 2 vols. Paris, 1905. | 
| BERTRAND | A. Bertrand, Religion des gaulois. Paris, 1897. | 
| CAMPBELL, WHT | J. F. Campbell, Popular Tales of the West Highlands. 4 vols. Edinburgh, 1890. | 
| " LF | " Leabhar na Feinne. London, 1872. | 
| CAMPBELL, Superstitions | J. G. Campbell, Superstitions of the Highlands and Islands of Scotland. 1900. | 
| " Witchcraft | " Witchcraft and Second Sight in the Highlands and Islands of Scotland. 1902. | 
| CORMAC | Cormac's Glossary. Tr. by J. O'Donovan. Ed. by W. Stokes. Calcutta, 1868. | 
| COURCELLE-SENEUIL | J. L. Courcelle-Seneuil, Les dieux gaulois d'après les monuments figurés. Paris, 1910. | 
| CIL | Corpus Inscriptionum Latinarum. Berlin, 1863 f. | 
| CM | Celtic Magazine. Inverness, 1875f. | 
| CURTIN, HTI | J. Curtin, Hero Tales of Ireland. 1894. | 
| " Tales | " Tales of the Fairies and Ghost World. 1895. | 
| DALZELL | Sir J. G. Dalzell, Darker Superstitions of Scotland. 1835. | 
| D'ARBOIS | H. D'Arbois de Jubainville, Cours de litterature celtique. 12 vols. Paris, 1883-1902. | 
| " Les Celtes | " Les Celtes. Paris, 1904. | 
| " Les Druides | " Les Druides et les dieux celtiques à formes d'animaux. Paris, 1906. | 
| " PH | " Les premiers habitants de l'Europe. 2 vols. Paris, 1889-1894. | 
| DOM MARTIN | Dom Martin, Le religion des gaulois. 2 vols. Paris, 1727. | 
| DOTTIN | G. Dottin, Manuel pour servir à l'étude de l'antiquité celtique. Paris, 1906. | 
| ELTON | C. I. Elton, Origins of English History. London, 1890. | 
| FRAZER, GB2 | J. G. Frazer, Golden Bough2. 3 vols. 1900. | 
| 
 | |
| GUEST | Lady Guest, The Mabinogion. 3 vols. Llandovery, 1849. | 
| HAZLITT | W. C. Hazlitt, Faiths and Folk-lore: A Dictionary of National Beliefs, Superstitions, and Popular Customs. 2 vols. 1905. | 
| HOLDER | A. Holder, Altceltischer Sprachschatz. 3 vols. Leipzig, 1891 f. | 
| HULL | Miss E. Hull, The Cuchullin Saga. London, 1898. | 
| IT. | See Windisch-Stokes. | 
| JAI | Journal of the Anthropological Institute. London, 1871 f. | 
| JOYCE, OCR | P. W. Joyce, Old Celtic Romances2. London, 1894. | 
| " PN | " History of Irish Names of Places4. 2 vols. London, 1901. | 
| " SH | " Social History of Ancient Ireland. 2 vols. London, 1903. | 
| JULLIAN | C. Jullian, Recherches sur la religion gauloise. Bordeaux, 1903. | 
| KEATING | Keating, History of Ireland. Tr. O'Mahony. London, 1866. | 
| KENNEDY | P. Kennedy, Legendary Fictions of the Irish Celts. 1866. | 
| LARMINIE | W. Larminie, West Irish Folk-Tales and Romances. 1893. | 
| LEAHY | Leahy, Heroic Romances of Ireland. 2 vols. London, 1905. | 
| LE BRAZ | A. Le Braz, La Legende de la Mort chez les Bretons armoricains. 2 vols. Paris, 1902. | 
| LL | Leabhar Laignech (Book of Leinster), facsimile reprint. London, 1880. | 
| LOTH | Loth, Le Mabinogion. 2 vols. Paris, 1889. | 
| LU | Leabhar na h-Uidhre (Book of the Dun Cow), facsimile reprint. London, 1870. | 
| MacBAIN | A. MacBain, Etymological Dictionary of the Gaelic Language. Inverness, 1896. | 
| MACDOUGALL | Macdougall, Folk and Hero Tales. London, 1891. | 
| MACKINLAY | J. M. Mackinlay, Folk-lore of Scottish Lochs and Springs. Glasgow, 1893. | 
| MARTIN | M. Martin, Description of the Western Islands of Scotland2. London, 1716. | 
| MAURY | A. Maury, Croyances et legendes du Moyen Age. Paris, 1896. | 
| MONNIER | D. Monnier, Traditions populaires comparées. Paris, 1854. | 
| MOORE | A. W. Moore, Folk-lore of the Isle of Man. 1891. | 
| NUTT-MEYER | A. Nutt and K. Meyer, The Voyage of Bran. 2 vols. London, 1895-1897. | 
| 
 | |
| O'CURRY, MC | E. O'Curry, Manners and Customs of the Ancient Irish. 4 vols. London, 1873. | 
| " Ms. Mat. | " MS. Materials of Ancient Irish History. Dublin, 1861. | 
| O'GRADY | S. H. O'Grady, Silva Gadelica. 2 vols. 1892. | 
| REES | Rev. W. J. Rees, Lives of Cambro-British Saints. Llandovery, 1853. | 
| REINACH, BF | S. Reinach, Bronzes Figurés de la Gaule romaine. Paris, 1900. | 
| " Catal. Sommaire | " Catalogue Sommaire du Musée des Antiquités Nationales4. Paris. | 
| " CMR | " Cultes, Mythes, et Religions. 2 vols. Paris, 1905. | 
| RC | Revue Celtique. Paris, 1870 f. | 
| RENEL | C. Renel, Religions de la Gaule. Paris, 1906. | 
| RHŶS, AL | Sir John Rhŷs, The Arthurian Legend. Oxford, 1891. | 
| " CB4 | " Celtic Britain4. London, 1908. | 
| " CFL | " Celtic Folk-Lore. 2 vols. Oxford, 1901. | 
| " HL | " Hibbert Lectures on Celtic Heathendom. London, 1888. | 
| SÉBILLOT | P. Sébillot, La Folk-lore de la France. 4 vols. Paris, 1904 f. | 
| SKENE | W. F. Skene, Four Ancient Books of Wales. 2 vols. Edinburgh, 1868. | 
| STOKES, TIG | Whitley Stokes, Three Irish Glossaries. London, 1862. | 
| " Trip. Life | " The Tripartite Life of Patrick. London, 1887. | 
| " US | " Urkeltischer Sprachschatz. Göttingen, 1894 (in Fick's Vergleichende Wörterbuch4). | 
| TAYLOR | I. Taylor, Origin of the Aryans. London, n.d. | 
| TSC | Transactions of Society of Cymmrodor. | 
| TOS | Transactions of the Ossianic Society. Dublin, 1854-1861. | 
| Trip. Life | See Stokes. | 
| WILDE | Lady Wilde, Ancient Legends and Superstitions of Ireland. 2 vols. 1887. | 
| WINDISCH, Táin | E. Windisch, Die altirische Heldensage Táin Bó Cúalgne. Leipzig, 1905. | 
| WINDISCH-STOKES, IT | E. Windisch and W. Stokes, Irische Texte. Leipzig, 1880 f. | 
| WOOD-MARTIN | Wood-Martin, Elder Faiths of Ireland. 2 vols. London, 1903. | 
| ZCP | Zeitschrift für Celtische Philologie. Halle, 1897 f. |