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Brief list of relevant books and lectures by Rudolf Steiner
Theosophy: An Introduction to the Supersensible Knowledge of the World and the Destination of Man
Occult Science an Outline (notably Chapter III)
The Dead are With Us
Man's Life on Earth and in the Spiritual Worlds
Earthly Death and Cosmic Life
The Inner Nature of Man and Life Between Death and Rebirth
Verses and Meditations (pp. 200 et seq. For meditations in relation to the Dead)
All the published works of Rudolf Steiner in print in English, as well as those by other authors on anthroposophical subjects, can be obtained through:
Rudolf Steiner Press35 Park Road, London NW1 6XT