Everett, C. C.: The Psychological Elements of Religious Faith. (A study in the definition and meaning of religion.)
Caird, Edward: Evolution of Religion. (Indoctrinated with the author's idealistic philosophy.)
Fielding, H.: The Hearts of Men. (A plea for the universal religion. Special feeling for Indian religions.)
Harnack, A.: What is Christianity? Translation by Saunders. (Attempt to define the essence of Christianity.)
Palmer, G. H.: The Field of Ethics, Chapters V and VI. (On the relation of ethics and religion.)
Brown, W. A.: The Essence of Christianity. (Special study of the definition of religion.)
Jastrow, M.: The Study of Religion. (Method of history and psychology of religion.)
Smith, W. Robertson: The Religion of the Semites. (Excellent study of tribal religions.)
Clarke, W. N.: What Shall We Think of Christianity? (An interpretation of Christianity.)
Leuba, J. H.: Introduction to a Psychological Study of Religion. In The Monist, Vol. XI, p. 195.