1. Hahnemann, S. Organon of Medicine (B. Jain Publishers (P) Ltd, New Delhi, 2012), 6th edn.
2. Hering, C. D. Hering’s materia medica (William P. Kildare, Philadelphia, 1872).
3. Allen, T. F. The encyclopedia of pure materia medica; a record of the positive effects of drugs upon the healthy human organism, vol. 7,8 (Boericke & Tafel, New York, Philadelphia, 1874).
4. Allen, T. F. The encyclopedia of pure materia medica; a record of the positive effects of drugs upon the healthy human organism, vol. 10 (Boericke & Tafel, New York, Philadelphia, 1879).
5. Allen, T. F. A handbook of materia medica and homoeopathic therapeutics (Boericke & Tafel, New York, Philadelphia, 1889).