Pünjer, Geschichte der christl. Religionsphilosophie, 2 vols. 1880-83.

Rauwenhoff, Wijsbegeerde van den Godsdienst, 2 vols. 1887 (also in German).

M. Jastrow, The Study of Religion, 1901.

L. H. Jordan, Comparative Religion, its Origin and Growth, 1905.

Revue de l'histoire des religions, edited by M. J. Réville.

Archiv für Religionswissenschaft, edited by Alb. Dieterich.

Reinach, Orpheus, Histoire Générale des Religions, 1909.

Hastings, Encyclopedia of Religion and Ethics, vol. i. A-Art, 1908.

The New Schaff-Heizog Encyclopedia of Religious Knowledge has excellent articles on the various religions.