1. American Public Health Association. (1955). “Standard Methods for the Examination of Water, Sewage, and Industrial Wastes,” 10th ed., pp. 395–404. Washington, D.C.
2. USE OF MEMBRANE FILTERS IN THE MEASUREMENT OF BIOLOGICAL INCORPORATION OF RADIOACTIVE ISOTOPES
3. “Vorläufige Mitteilung über die Färbung der Bakterien auf den Membranfiltern.”;Beling,1949