APA Format
World Health Organization . (2011). Helminth control in school-age children : a guide for managers of control programmes. : WHO
MLA Format
World Health Organization . Helminth control in school-age children : a guide for managers of control programmes. : WHO, 2011
Australian/Harvard Format
World Health Organization . 2011. Helminth control in school-age children : a guide for managers of control programmes. WHO, 
Warning: These citations may not always be 100% accurate.