Drew,Christina H. Duivenboden, J. V. B. (2000). Guidelines for evaluation of environmental health services. World Health Organization.
Chicago-viite (17. p.)Drew,Christina H. Duivenboden, Jaco Van Bonnefoy,Xavier. Guidelines for Evaluation of Environmental Health Services. Denmark: World Health Organization, 2000.
MLA-viite (8. p.)Drew,Christina H. Duivenboden, Jaco Van Bonnefoy,Xavier. Guidelines for Evaluation of Environmental Health Services. World Health Organization, 2000.
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