APA

Williams L. J., Mai C. T., Edmonds L. D., Shaw G. M., Kirby R. S., Hobbs C. A., Sever L. E., Miller L. A., Meaney F. J. & Levitt M. (20030303). Prevalence of spina bifida and anencephaly during the transition to mandatory folic acid fortification in the United States. : Teratology.

Chicago

Williams Laura J, Mai Cara T, Edmonds Larry D, Shaw Gary M, Kirby Russell S, Hobbs Charlotte A, Sever Lowell E, Miller Lisa A, Meaney F John and Levitt Miriam. 20030303. Prevalence of spina bifida and anencephaly during the transition to mandatory folic acid fortification in the United States. : Teratology.

Harvard

Williams L. J., Mai C. T., Edmonds L. D., Shaw G. M., Kirby R. S., Hobbs C. A., Sever L. E., Miller L. A., Meaney F. J. and Levitt M. (20030303). Prevalence of spina bifida and anencephaly during the transition to mandatory folic acid fortification in the United States. : Teratology.

MLA

Williams Laura J, Mai Cara T, Edmonds Larry D, Shaw Gary M, Kirby Russell S, Hobbs Charlotte A, Sever Lowell E, Miller Lisa A, Meaney F John and Levitt Miriam. Prevalence of spina bifida and anencephaly during the transition to mandatory folic acid fortification in the United States. : Teratology. 20030303.