”[Iberogast: a modern phytotherapeutic combined herbal drug for the treatment of functional disorders of the gastrointestinal tract (dyspepsia, irritable bowel syndrome)--from phytomedicine to "evidence based phytotherapy". A systematic review]” (på German). Forschende Komplementärmedizin und Klassische Naturheilkunde 9 (Suppl 1): sid. 1–20. 2002. doi:10.1159/000068645. PMID 12618546.
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”[Iberogast: a modern phytotherapeutic combined herbal drug for the treatment of functional disorders of the gastrointestinal tract (dyspepsia, irritable bowel syndrome)--from phytomedicine to "evidence based phytotherapy". A systematic review]” (på German). Forschende Komplementärmedizin und Klassische Naturheilkunde 9 (Suppl 1): sid. 1–20. 2002. doi:10.1159/000068645. PMID 12618546.