1. Anonymous: Biodisk information service. AB Biodisk, Stockholm, Sweden 1973.
2. Anonymous: Difco Manual, Ninth Edition. Difco Laboratories, Inc., Detroit, USA 1953.
3. Anonymous: Information from A/S Orthana Kemisk Fabrik, Copenhagen, Denmark 1973.
4. Anonymous: Oxoid Manual, Third Edition. Oxoid Ltd., London, England 1969.
5. Anonymous: Pre-weighed dehydrated culture media. Mast Laboratories, Liverpool, England 1972.