--Essays and Addresses on the Philosophy of Religion. London, 1921.

_Jacopone da Todi_. Le Laude, secondo la stampa fiorentino del 1490. A cura di G. Ferri. Bari, 1915.

The Life of the Spirit and the Life of To-day — Part 149

_William James_. The Varieties of Religious Experience. London, 1902.

The Life of the Spirit and the Life of To-day — Part 149

_William James_. The Will to Believe and other Essays. London, 1897.

The Life of the Spirit and the Life of To-day — Part 149

--Principles of Psychology. London, 1901.

_St. John of the Cross_. The Ascent of Mount Carmel, trans. by David Lewis. London, 1906.

--The Dark Night of the Soul, trans. by David Lewis. London, 1908.

_Sir Henry Jones and J.H. Muirhead_. The Life and Philosophy of Edward Caird. Glasgow, 1921.

_Rufus Jones_. Studies in Mystical Religion. London, 1909.

--Spiritual Reformers in the Sixteenth and Seventeenth Centuries. London, 1914.

_Julian of Norwich_. Revelations of Divine Love, edited by Grace Warrack. London, 1901.

_C.G. Jung_. The Psychology of the Unconscious. London, 1916.

_Kabir_. One Hundred Poems, edited by Rabindranath Tagore and Evelyn Underhill. London, 1915.

_Thomas à Kempis_. The Imitation of Christ: the Earliest English Translation (Everyman's Library). London, n.d.

_S. Kettlewell_. Thomas à Kempis and the Brothers of the Common Life. London, 1882.

_William Law_. Liberal and Mystical Writings, edited by W. Scott Palmer. London, 1908.

_W.P. Livingstone_. Mary Slessor of Calabar. London, 1918.

Journal Spirituel de Lucie-Christine. Paris, 1912.

_W. McDougall_. An Introduction to Social Psychology, 9th ed. London, 1915.

_W.M. McGovern_. An Introduction to Mahãyãna Buddhism. London, 1921.

_Mechthild of Magdeburg_. Das Fliessende Licht der Gottheit. Regensburg, 1869.

_Reynold Nicholson_. Selected Poems from the Divãni, Shamsi Tabriz. Cambridge, 1898.

--Studies in Islamic Mysticism. Cambridge, 1921.

_J.H. Overton_. John Wesley. London, 1891.

_William Penn_. No Cross, No Crown. London, 1851.

_Plotinus_. The Ethical Treatises, trans. from the Greek by Stephen Mackenna. London, 1917.

_Plotinus_. The Physical and Psychical Treatises, trans. from the Greek by Stephen Mackenna. London, 1921.

_J.B. Pratt_. The Religious Consciousness; a Psychological Study. New York, 1921.

_Richard of St. Victor._ Opera Omnia. Migne, Pat Lat., t. 196.

_W.H.R. Rivers_. Instinct and the Unconscious, Cambridge, 1920.