● Watson SW (1965). Characteristics of a marine nitrifying bacterium, Nitrosocystis oceanus sp. n. Limnol. Oceanogr. 10, 274-289.
● Watson SW (1971). Taxonomic considerations of the family Nitrobacteriaceae Buchanan. Requests for opinions. Int. J. Syst. Bacteriol. 21, 254-270.
