Rudolf Steiner. 1861  1925. Life and work history. Volume 1: Childhood, youth, Vienna (1861  1890) - Peter Selg [pocket book]
Rudolf Steiner. 1861 – 1925. Lebens- und Werkgeschichte. Band 1: Kindheit, Jugend, Wien (1861 – 1890) - Peter Selg  [Taschenbuch]