This translation originally published: 1969. - Translation and revision of: 'Wie erlangt man Erkenntnisse der höheren Welten?' 20.Aufl. Dornach : Verlag der Rudolf Steiner-Nachlassverwaltung, 1961.
Knowledge of the higher worlds : how is it achieved? by Rudolf Steiner. ISBN 0854402217. Published by Rudolf Steiner Press in 1976. Publication and catalogue information, links to buy online and reader comments.