Athanassiadi, Polymnia. "A Contribution to Mithraic Theology: The Emperor Julian's Hymn to King Helios," Journal of Theological Studies, N.S., XXVIII, Pt. 2, October 1977, 360-71. Helios-Mithras as a Mediating God.
Burkert, Walter. Lore and Science in Ancient Pythagoreanism, tr. Edwin L. Minar, Jr. Cambridge: Harvard University Press, 1972.
Butterworth, E. A. S. Some Traces of the Pre-Olympian World. Berlin: Walter de Gruyter & Co., 1966. Helen, the Tree, etc.
Butterworth, E. A. S. The Tree at the Navel of the Earth. Berlin: Walter de Gruyter & Co., 1970. The Tree, Helen, etc.
Dillon, John, The Middle Platonists: 80 B.C. to A.D. 220, rev. ed. Ithaca: Cornell University Press, 1996.
Gwyn Griffiths, J. Triads and Trinity. Cardiff: University of Wales Press, 1996. A wide-ranging study of triads and triunities in the ancient world.
Johnston, Sarah Iles. Hekate Soteira: A Study of Hekate’s Role in the Chaldean Oracles and Related Literature. Atlanta: Scholars Press, 1990.
Kerényi, Carl. The Gods of the Greeks. London: Thames & Hudson, 1979. General mythological reference.
Kerényi, Carl. The Heroes of the Greeks. London: Thames & Hudson, 1959. General mythological reference.
Kingsley, Peter. Ancient Philosophy, Mystery, and Magic: Empedocles and Pythagorean Tradition. Oxford: Oxford University Press, 1995. A comprehensive, profound study of the roots of the Pythagorean Tradition.
Kingsley, Peter. In the Dark Places of Wisdom. Inverness: Golden Sufi Center, 1999. Especially concerned with the role of Parmenides in the Pythagorean Tradition
Lamberton, Robert. Homer the Theologian: Neoplatonist Allegorical Reading and the Growth of the Epic Tradition. Berkeley: University of California Press, 1986.
Lewy, Hans. Chaldean Oracles and Theurgy: Mysticism, Magic and Platonism in the Late Roman Empire, new ed. by Michel Tardieu. Paris: Études Augustiniennes, 1978.
Majercik, Ruth. The Chaldean Oracles: Text, Translation, and Commentary. Leiden: E. J. Brill, 1989.
Mallory, J. P. In Search of the Indo-Europeans: Language, Archaeology and Myth. London: Thames & Hudson, 1989.
Opsopaus, John. "The Ancient Greek Esoteric Doctrine of the Elements." Circle Magazine, issues 68-71 (1998-9). Expanded version available at omphalos.org/BA.
Opsopaus, John. Guide to the Pythagorean Tarot: An Interpretation Based on Pythagorean and Alchemical Principles. St. Paul: Llewellyn, 2001.
Opsopaus, John. "Liber de Octo Mutationibus: The Book of Eight Changes: Universal Cycles and the Trigrams." 1995. Available at omphalos.org/BA.
Opsopaus, John. "Orphica Holodemiurgia." 1998. Available at omphalos.org/BA. The annotations contain additional information on Aiôn, Time, the Celestial Spheres, etc.
Opsopaus, John. "The Ritual of the Labyrinth: Ta Hiera Laburinthou." 1997. Available at omphalos.org/BA.
Plato. Plato’s Cosmology: The Timaeus of Plato, translated with a running commentary, by F. M. Cornford. New York: Humanities Press, n.d., c.1937.
Plutarch. "Isis and Osiris," in Moralia, vol. V, transl. F. C. Babbitt. Loeb Classical Library, Cambridge: Harvard University Press, 1936.
Proclus. The Elements of Theology, 2nd ed., rev. text, transl., & comm., E. R. Dodds. Oxford: Oxford University Press,1963.
Proclus. The Theology of Plato, tr. Thomas Taylor. Vol. VIII of Thomas Taylor Series. Somerset: Prometheus Trust, 1995.
Sallustius. Concerning the Gods and the Universe, ed. with proleg. & transl., A. D. Nock. Chicago: Ares Publishers, 1996; reprint of Cambridge, 1926, ed.
Schibli, Hermann S. Pherekydes of Syros. Oxford: Oxford University Press, 1990.
Shaw, Gregory. Theurgy and the Soul: The Neoplatonism of Iamblichus. University Park: Pennsylvania State University Press, 1995.
Siorvanes, Lucas. Proclus: Neo-Platonic Philosophy and Science. Edinburgh: Edinburgh University Press, 1996.
Watkins, Calvert (ed.). The American Heritage Dictionary of Indo-European Roots, 2nd ed. Boston: Houghton Mifflin Company, 2000. Modern etymology.
West, M. L. Early Greek Philosophy and the Orient. Oxford: Oxford University Press, 1971. Zurvân, Zoroastrianism, etc.
Woodhouse, C. M. Gemistos Plethon: The Last of the Hellenes. Oxford: Oxford University Press, 1986.
