World Health Organization. (2002). Helminth control in school-age children: A guide for managers of control programmes (Segunda edición.). Word Health Organization.
Chicago-referens (17:e uppl.)World Health Organization. Helminth Control in School-age Children: A Guide for Managers of Control Programmes. Segunda edición. Geneva: Word Health Organization, 2002.
MLA-referens (8:e uppl.)World Health Organization. Helminth Control in School-age Children: A Guide for Managers of Control Programmes. Segunda edición. Word Health Organization, 2002.
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