1. Bonner, J.: Plant Biochemistry. New York: Academic Press 1950.
2. Boysen Jensen, B.: Plantefysiologi. København: Munksgaards Forlag 1943.
3. Cilfton, O.E.: Introduction to bacterial physiology. New York: McGraw-Hill Book Company 1957.
4. Gatttheret, R. J.: Manuel technique de culture des tissus végétaux. Paris: Masson &Cie. 1942.
5. Larsen, P.: Nomenclature of plant growth substances. Plant Physiol. 30, 190 (1955).