1. Aristotelis Opera ex recensione Immanuelis Bekkeri, in: Hermannus Bonitz (Ed.), Index Aristotelicus, Berlin 1870 (2. Aufl. Berlin 1961).
2. B.E. Burdikin, Mumio—The Resin of Life. ID “BES”, Saint Petersburg, 2001 (Russian text).
3. P.H. Raven, R.F. Evert, H. Curtis, Biology of Plants, Worth Publishers, New York, 1981.
4. G. Steinmüller, Perlen der russischen Medizin (Pearls of Russian medicine), Selbstverlag.