Evelyn Underhill
An English Anglo-Catholic writer and pacifist known for her numerous works on religion and spiritual practice, in particular Christian mysticism (<a href=https://en.wikipedia.org/wiki/Evelyn_Underhill>Wikipedia</a>).
Books
The spiritual life
1900
ISBN 9780060688110
Mysticism
1911
ISBN 9780452005754
Practical mysticism
1914
ISBN 9798789483954
The Cloud of Unknowing
1922
ISBN 9780486121321