Dyfyniad APA

ebrary, Inc. (1998). Technical and ethical guidelines for workers' health surveillance. International Labour Office.

Dyfyniad Arddull Chicago

ebrary, Inc. Technical and Ethical Guidelines for Workers' Health Surveillance. Geneva: International Labour Office, 1998.

Dyfyniad MLA

ebrary, Inc. Technical and Ethical Guidelines for Workers' Health Surveillance. International Labour Office, 1998.

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