1. American Conference of Governmental Industrial Hygienists (ACGHI),1973
2. American Conference of Governmental Industrial Hygienists (ACGIH),1993
3. Index for evaluating heat stress in terms of resulting physiological strain;Belding;Heating Piping and Air Conditioning,1955
4. Estimation of work metabolism using qualitative job descriptors;Bernard;American Industrial Hygiene Association Journal,1994