Clark, W. I. (1922). Health service in industry. The Macmillan company.
Lua i Stíl Chicago (17ú heag.)Clark, William Irving. Health Service in Industry. New York: The Macmillan company, 1922.
Lua MLA (8ú heag.)Clark, William Irving. Health Service in Industry. The Macmillan company, 1922.
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