APA
World Health Organization, . (2002). IPCS (Environmental health criteria no - 228): principles and methods for the assessment of risk from essential trace elements. Geneva: UNEP and World Health Organization.
Chicago
World Health Organization, . 2002. IPCS (Environmental health criteria no - 228): principles and methods for the assessment of risk from essential trace elements. Geneva: UNEP and World Health Organization.
Harvard
World Health Organization, . (2002). IPCS (Environmental health criteria no - 228): principles and methods for the assessment of risk from essential trace elements. Geneva: UNEP and World Health Organization.
MLA
World Health Organization, . IPCS (Environmental health criteria no - 228): principles and methods for the assessment of risk from essential trace elements. Geneva: UNEP and World Health Organization. 2002.