North America
Project Gutenberg EPUB3 edition
Toy, Crawford Howell and Jastrow, Morris
Mommsen, Th. Römische Geschichte (new ed., Berlin, 1856-1887; Eng. tr., London and New York, 1870, 1894, 1903).
Zeller, E. Religion und Philosophie bei den Römern (in his Beiträge und Abhandlungen) (Berlin, 1872).
Boissier G. La religion romaine d'Auguste aux Antonins (2d ed., Paris, 1878).
Renan, E. Influence of the Institutions, Thought and Culture of Rome on Christianity (London, 1880).
Preller-Jordan. Römische Mythologie (Berlin, 1881-1883).
Aust, E. Religion der Römer (Münster, Westphalia, 1899).
Wissowa, G. Religion und Kultus der Römer (Munich, 1902).
Fowler, W. W. Roman Festivals of the Period of the Republic (London, 1899); Social Life at Rome in the Age of Cicero (New York, 1910); Religious Experience of the Roman People (London, 1911).
Friedländer, L. Sittengeschichte Roms (8th ed., Leipzig, 1910); Eng. tr. of 7th ed., Roman life and Manners under the Early Empire (London and New York ca. 1903).
Glover, T. R. Conflict of Religions in the Early Roman Empire (2d ed., London, 1909).
Gruppe, G. Kulturgeschichte der römischen Kalserzeit (München, 1903-1904).615
Carter, J. B. Religion of Numa (London, 1906); The Religious Life of Ancient Rome (Boston and New York, 1911).
Reinach, S. Orpheus [a general history of religions], chap. iii (Paris, 1909; Eng. tr., revised by the author, London and New York, 1909).
Arnold, E. V. Roman Stoicism (Cambridge, England, 1911).
Etruscan
Herbig, G. Article "Etruscan Religion" (in Hastings's Encyclopædia of Religion and Ethics).
Celtic
Rhys, J. Celtic Heathendom (London, 1886).
Bertrand, A. Religion des Gaulois (2d ed., Paris, 1891).
Ihm, M. Der Mütter-oder Matronenkultus und seine Denkmäler, Bonner Jahrbücher (1887).
MacCulloch J. A. Religion of the Ancient Celts (Edinburgh, 1911); article "Celts" (in Encyclopædia of Religion and Ethics); article "Druids," ibid.
Gruffydd, W. J. Welsh Literature (in article "Celt" in Encyclopædia Britannica, 11th ed.).
Quiggin, E. C. Article "Celtic Languages and Literature," ibid.
Robinson, F. N. Article "Deae Matres" (in Encyclopædia of Religion and Ethics).
Revue Celtique (Paris).
Celtic Review, Edinburgh.
Teutonic
Grimm, J. Deutsche Mythologie (Berlin, 1835; 4th ed., 1875-1878); Kleinere Schriften (Berlin, 1864-1890).
Müllenhoff, K. Deutsche Altertumskunde (Berlin, 1870-1892).
Bugge, S. Studier over de nordiske Gude-og Heltesagns oprindelse (1880); Germ. tr., Studien über die Entstehung der nordischen Götterund Heldensagen (Munich, 1889).
Gruppe, O. Griechische Culte und Mythen in ihren Beziehungen zu den orientalischen Religionen, Index (Leipzig, 1887).
Mogk, E. Germanische Mythologie (in Paul's Grundriss der germanischen Philologie) (2d ed., Strassburg, 1898).
Meyer, E. H. Germanische Mythologie (Berlin, 1891).
Gummere, F. B. Article "Teutonic (or Germanic) Mythology" (in Johnson's Universal Cyclopædia); Germanic Origins (New York, 1892).
La Saussaye, P. D. Chantepie de. Religion of the Teutons (with bibliography) (Boston and London, 1902).
Chadwick, H. M. Article "Teutonic Peoples," p. 683 ff. (in Encyclopædia Britannica, 11th ed.).
Mannhardt, W. Baumcultus der Germanen und ihrer Nachbarstämme 616(Berlin, 1875); Antike Wald- und Feldkulte aus nordeuropäischen Uberlieferungen erläutert (Berlin, 1877); Mythologische Forschungen, Quellen und Forschungen (1884).
Jónsson, F. Article "The Eddas" (in Hastings's Encyclopædia of Religion and Ethics).
Vigfusson, G., and Powell, F. York. Corpus Poeticum Boreale (Old Norse Poetry, Scaidic and Eddic) (Oxford, 1883).
Thorpe, B. Metrical Translation of the Edda (London, 1866).