1. The United States Pharmacopoeia XIX, Mack Printing Co., Easton, Pa., 1975, pp. 173–175
2. Pharmacopoea Nordica 1963, Editio Danica, Nyt Nordisk Forlag, A. Busck, Copenhagen 1963
3. European Pharmacopoeia Volume III, Maisonneuve S. A., France, 1975, pp. 17–19
4. Die Mutterkornalkaloide;Hofmann,1964