APA (7 वां संस्करण) प्रशस्ति पत्र

Não informado. (1953). Occupational health bulletin. Department of National Health and Welfare, Industrial Health Division.

शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र

Não informado. Occupational Health Bulletin. Ottawa: Department of National Health and Welfare, Industrial Health Division, 1953.

एमएलए (8वां संस्करण) प्रशस्ति पत्र

Não informado. Occupational Health Bulletin. Department of National Health and Welfare, Industrial Health Division, 1953.

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