A book of contemplation : the which is called The cloud of unknowing, in the which a soul is oned with God

MLA

Underhill, Evelyn. A Book of Contemplation : the Which Is Called The Cloud of Unknowing, In the Which a Soul Is Oned with God. London: Watkins, 1922.

APA

Underhill, E. (1922). A book of contemplation : the which is called The cloud of unknowing, in the which a soul is oned with God. London: Watkins.

Chicago

Underhill, Evelyn, ed. A Book of Contemplation: The Which Is Called The Cloud of Unknowing, In the Which a Soul Is Oned with God. London: Watkins, 1922.