

@book {6279,
	title = {Principles of {Epidemiology} in {Public} {Health} {Practice}- 3rd {Edition} -{An} {Introduction} to {Applied} {Epidemiology} and {Biostatistics}},
	year = {2012},
	url = {http://www.cdc.gov/ophss/csels/dsepd/ss1978/ss1978.pdf},
	author = {CDC}
}
