History and biographies
- Selg P. Rudolf Steiner. Life and Work. Volume IV (1914 – 1918). The Years of World War I. Great Barrington: SteinerBooks, 2016.
- Selg P. Rudolf Steiner. Life and Work. Volume III (1900 – 1914). Spiritual Science and Spiritual Community. Great Barrington: SteinerBooks, 2015.
- Selg P. Rudolf Steiner. Life and Work. Volume II (1890 – 1900). Weimar and Berlin. Great Barrington: SteinerBooks, 2014.
- Selg P. Rudolf Steiner. Life and Work. Volume I (1861 – 1890). Childhood, Youth, and Study Years. Great Barrington: SteinerBooks, 2014.
- Selg P. I am for going ahead. Ita Wegman’s Work for the Social Ideals of Anthroposophy. GreatBarrington: SteinerBooks, 2012.
- Zeylmans van Emmichoven J. Who was Ita Wegman? A documentation. Vol. I 1876 – 1925. Spring Valley: Mercury Press, 2005.
- Zeylmans van Emmichoven J. Who was Ita Wegman? A documentation. Vol. II 1925 – 1943. Spring Valley: Mercury Press, 2005.
- Zeylmans van Emmichoven J. Who was Ita Wegman? A documentation. Vol. III 1924 – 1943. Struggles and conflicts. Spring Valley: Mercury Press, 2005.