(EN) Linda Chalker-Scott, The Science Behind Biodynamic Preparations: A Literature Review, in HortTechnology, vol. 23, n. 6, 1º dicembre 2013, pp. 814–819. URL consultato il 6 settembre 2017 (archiviato dall'url originale il 4 novembre 2020).
«Given the thinness of the scientific literature and the lack of clear data supporting the efficacy of biodynamic preparations, biodynamic agriculture is not measurably distinct from organic agriculture and should not be recommended as a science-based practice at this time.»