@book{2993,
	author = {Bergsma, D. and Symposium on the Placenta, New York, 1964.},
	title = {Placenta; its form and functions, with particular reference to the prevention of birth defects and fetal deaths.},
	publisher = {National Foundation,},
	year = {1965.},
	series = {(Birth defects; original article series, v.1, no. 1, April 1965).},
	address = {New York : }
}