(This list is still a work in progress.)
NORSE
Edda, Snorri Sturluson/Anthony Faulkes, Everyman Press, Penguin, 1992. (reprint)
The Prose Edda, Snorri Sturluson/Jesse Byock, Penguin Classics, 2005.
The Poetic Edda, Carolyne Larrington (trans.) Oxford UP, 1996.
The Poetic Edda, Hollander, Lee M. (trans.), University of Texas, Austin 1962/1990. (2nd edition, revised)
The Elder Edda, a Book of Viking Lore, Andy Orchard (trans.), Penguin Classics, 2011.
Heimskringla, Snorri Sturluson, ed. and trans. Erling Monsen and A. H. Smith, Courier Publications, 1990.
Saxo Grammaticus: The History of the Danes Books I – IX, Saxo Grammaticus/Peter Fisher, translation, Hilda Ellis Davidson, commentary, Brewer, 1999. (reprint)
Dictionaries:
Lindow, John 2001: Norse Mythology: A Guide to the Gods, Heroes, Rituals and Beliefs, OUP, New York and Oxford.
Orchard, Andy 2002: Cassell’s Dictonary of Norse Myth and Legend, Cassell Reference.
Simek, Rudolf (trans. Angela Hall) 1996: Dictionary of Northern Mythology, D. S. Brewer, Cambridge.
Other Sources:
Clunies Ross, Margaret 1994: Prolonged Echoes: Old Norse myths in medieval Northern society, vol. 1, The Viking Society Vol. 7, Odense UP.
Davidson, H. R. E. 1990: Gods and Myths of Northern Europe, Penguin (reprint).
Jochens, Jenny 1996: Old Norse Images of Women, University of Pennsylvania.
Jóhanna Katrín Friðriksdóttir 2013: Women in Old Norse Literature, Palgrave Press.
Kalinke, Marianne 1990: Bridal-Quest Romance in Medieval Iceland, Cornell University Press.
Karlsdottir, Alice 2003: Mythology of the Norse Goddesses: Mythology, Ritual, Traceworking, Runa-Raven Press.
Motz, Lotte 1993: The beauty and the hag: Female figures of Germanic faith and myth (Philologica Germanica), Fassbaender.
CELTIC
Davies, Sioned (trans) The Mabinogion, OUP, 2008.
Ford, Patrick K. (trans.) The Mabinogion, Penguin, 1977.
Kinsella, Thomas (trans.) The Tain, OUP, 1969.
Stokes, Whitley (trans.) “The Second Battle of Moytura”, Revue Celtique 12, 1891, pp. 52–130, 306–308.
Gantz, Jeffrey (trans.) Early Irish Myths and Legends, Penguin Classics, 1981.
Lady Gregory, Gods and Fighting Men, Colin Smythe, 1993 (reprint).
Lady Gregory, A Book of Saints and Wonders, Colin Smythe, 1972.
Dictionaries:
Green, Miranda 1997: Dictonary of Celtic Myth and Legend, Thames and Hudson.
MacKillop, James 2004: An Oxford Dictionary of Celtic Mythology, OUP.
Other Sources:
Green, Miranda 1995: Celtic Goddesses: Warriors, Virgins and Mothers, British Museum Press.
Jufer, Nicole and Thierry Lughinbuhl 2001: Les dieux gaulois: répertoire des noms de divinités celtiques connus par l’épigraphie, les textes antiques et la toponymie, Editions Errance, University of Virginia.
Koch, John T. 2000: The Celtic Heroic Age, Celtic Studies Publications; 3rd edition.
MacLeod, Sharon Paice 2011: Celtic Myth and Religion: A Study of Traditional Belief, with Newly Translated Prayers, Poems and Songs, McFarland. (Kindle)
O hOgain, Daithi 1991: Myth, Legend and Romance: An Encylopedia of Irish Folk Tradition, MacMillan.
Olmstead, Garrrett 1994: The Gods of the Celts and Indo-Europeans, Verlag des Instituts für Sprachwissenschaft der Universität Innsbruck.
Ross, Anne 1992: Pagan Celtic Britain: Studies in Iconography and Tradition, Constable and Sons.
Sjoestedt, Marie-Louise 2000: Celtic Gods and Heroes, Dover Publications (Kindle Edition).
GREEK, ROMAN AND EGYPTIAN
Adkins, Lesley and Roy A. Adkins 1996: Dictionary of Roman Religion, OUP.
Barrett, Clive 1992: The Egyptian Gods and Goddesses: the Mythology and Beliefs of Ancient Egypt, Aquarian Press, London.
Christensen, Lisbeth Bredholt, Olav Hammer and David A. Warburton (eds.) 2013: The Handbook of Religions in Ancient Europe, Routledge.
Hart, George 1996: A Dictionary of Egyptian Gods and Goddesses, Routledge, London.
Lurker, Manfred 1987: Dictionary of Gods and Goddesses, Devils and Demons, Routledge, London. (trans. Angela Hart)
SUN-GODDESSES
Goodison, Lucy, 1989: Death, Women and the Sun, Symbolism of Regeneration in Early Minoan Religion, Institute of Classical Studies, Bulletin Supplement no. 53.
Kerényi, Karl 1979: Goddesses of the Sun and Moon, trans. Murray Stein, Spring Publications.
McCrickard, Janet 1990: Eclipse of the Sun: An investigation into sun and moon myths, Gothic Image.
McGrath, Sheena 1997: The Sun-Goddess: Myth, Legends and History, Blandford.
Monaghan, Patricia 1994: O Mother Sun! A New View of the Cosmic Feminine, The Crossing Press.
GENERAL
The Kalevala, Elias Lönnrot/Keith Bosley, Oxford World Classics, 2008.
The Seletected Canterbury Tales, Geoffrey Chaucer/Shelia Fischer, W. W. Norton, 2012. (Kindle)
Dowden, Ken 2000: European Paganism: the Realities of Cult from Antiquity to the Middle Ages, Routledge.
Puhvel, Jaan 1987: Comparative Mythology, The John Hopkins University Press.
West, M. L. 2007: Indo-European Poetry and Myth, OUP.