1. Kluyver, A. J., Proc. Koninklijke van Wetenschappen te Amsterdam 35: 1 (1932).
2. Korinek, J., Centralblatt fur Bakteriologie, Abt II 71: 73 (1927).
3. Physiology of Bacteria 1932
4. ZoBell, C. E., Bulletin of the American Association of Petroleum Geologists 20: 258 (1936).
5. ZoBell, C. E., Proceedings of the Fifth Pacific Science Congress 3: 2097 (1933).