1. ACGIH American Conference of Governmental Industrial Hygienists https://www.acgih.org/tlv-bei-guidelines/tlv-chemical-substances-introduction.
2. AIHA American Institute of Industrial Hygienists https://www.aiha.org/
3. BASF Medical Guidelines https://collaboration.basf.com/portal/basf/en
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5. C&EN1984 “India's Chemical Tragedy: Death toll at Bhopal still rising” Chemical and Engineering News American Chemical Society December.