Pbk. 14/-. sbn 85440 221 7.
Previous ed. (B63-16794) 1963, published as 'Knowledge of the higher worlds and its attainmment'.
Knowledge of the higher worlds: how is it achieved? by Rudolf Steiner. ISBN 0854402209. Published by Rudolf Steiner P. in 1969. Publication and catalogue information, links to buy online and reader comments.