@book{156969,
	author = {Martin, Joyce A. and MacDorman, Marian F. and National Center for Health Statistics U.S.},
	title = {Triplet births},
	publisher = {U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Center for Health Statistics},
	year = {1997.},
	series = {DHHS publication},
	address = {Hyattsville, Md.},
	note = {"January 1997."}
}