1. Perry , J. H. 1950.Chemical Engineers' Handbook., 3rd Ed., 170New York, N. Y.: McGraw-Hill Book Co., Inc.
2. Threshold Limit Values for 1963
3. Henderson , Y. and Haggard , H. W. 1943.Noxious Gases and the Principles of Respiration Influencing Their Action., 134New York: Reinhold Publishing Corp.
4. Nitrogen Dioxide