Pell, S. (May 1993). "Epidemiologists in industry. Past achievements, unexplored opportunities, and future needs". Journal of Occupational Medicine. 35 (5): 485–492. ISSN0096-1736. PMID8515320.
"Asbestos". Occupational Safety and Health Administration. 2014.
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Pell, S. (May 1993). "Epidemiologists in industry. Past achievements, unexplored opportunities, and future needs". Journal of Occupational Medicine. 35 (5): 485–492. ISSN0096-1736. PMID8515320.