Journal of the Society for Psychical Research

Vol. 17, London 1915.

Proceedings of the Society for Psychical Research

Vol. 28, 1915.

Proceedings of the Society for Psychical Research

Vol. 29, London 1916.

Charles Vernon Boys

Soap-bubbles, their colours and the forces which mould them

Society for promoting Christian Science, London 1916 (I ed. 1896).

Journal of the Society for Psychical Research

Vol. 18, London 1917.

Proceedings of the Society for Psychical Research

Vol. 30, 1918.

Stuart Cumberland

That other world: personal experiences of mystics and their mysticism

Grant Richards, London 1918.