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2. ANSI/AMCA Standards;Air Moving and Conditioning Association, Inc. (AMCA),1986
3. Aisiks, E.G., and Danziger, N.H. (1969) Ventilation Research Program at Cascade Tunnel, Northern Railway Bulletin 622, American Railway Engineering Association (AREA).
4. American Conference of Governmental Industrial Hygienists (ACGIH) (1992) ACGIH Industrial Ventilation, 21st edition, Lansing Michigan.
5. American Conference of Governmental Industrial Hygienists (ACGIH) (1994) ACGIH TLVs: Threshold Limit Values and Biological Exposure Indices for 1993-1994, Cincinnati, Ohio.