Biodynamic fieldpreparations in development, 70 years of practice, research and opinions
With summary in English
Edith T. Lammerts van Bueren,
J. Beekman-de Jonge.
1995. Biodynamic fieldpreparations in development, 70 years of practice, research and opinions: With summary in English.
Louis Bolk Instituut, Driebergen.