@book{39,
	author = {Pollock, Thomas Millar and Bell, J. A. and World Health Organization.},
	title = {Trials of prophylactic agents for the control of communicable diseases : a guide to their organization and evaluation.},
	publisher = {World Health Organization,},
	year = {1966.},
	series = {WHO monograph series ; no. 52},
	address = {Geneva : }
}