1. M. B. Jacobs, The Analytical Chemistry of Industrial Poisons, Hazards and Solvents. New York: Intersoience. 1949. S. 33.
2. M. B. Jacobs, The Chemical Analysis of Air Pollutants. New York: Interscience. 1960. S. 10?11.
3. P. L. Magill, F. R. Holden undC. Ackley, Air Pollution Handbook. New York-Toronto-London: McGraw-Hill. 1956. S. 10?30.
4. A. C. Stern, Air Pollution. New York-London: Academic Press. 1962. S. 413.
5. F. Pregl, Die quantitative organische Mikroanalyse. Berlin: J. Springer. 1935. S. 114.