1. Paracelsus, Haber and Arndt
2. V.—On the Connection between Chemical Constitution and Physiological Action. Part. I.—On the Physiological Action of the Salts of the Ammonium Bases, derived from Strychnia, Brucia, Thebaia, Codeia, Morphia, and Nicotia
3. Zur Theorie der Alkoholnarkose
4. Overton, C. E. Gustav Fischer; Jena: Switzerland, 1901; English translation by Lipnick, R. L.; Chapman and Hall: London, 1991.