

@booklet {1924,
	title = {Guidelines On Environmental Surveillance For Detection Of Polioviruses Working draft -March 2015},
	year = {2015},
	publisher = {WHO, Dept of Vaccines and Biologicals; http://www.polioeradication.org/Portals/0/Document/Resources/GPLN_publications/GPLN_GuidelinesES_April2015.pdf last accessed 17-05-2015.},
	type = {Online Database},
	url = {http://www.polioeradication.org/Portals/0/Document/Resources/GPLN_publications/GPLN_GuidelinesES_April2015.pdf},
	author = {WHO}
}
